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Drama = 5, chess = 4 so we are left with 8 volunteers
To understand number of valid teams, we need to know number of members from each club.

Statement 1:
Robotics = 3 and arts =2, we are still left with 3 members and we don't know how they are distributed so insufficient

Statement 2:
The remaining 8 students could be distributed as 1+7 or 2+6 and both would satisfy the condition. This will lead to different number of valid teams so insufficient

Combining:
Remaining 3 students would all have to be part of one club only. So now we have number of members of each club so we can get number of teams from it. Thus sufficient, so c.
Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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Total volunteers - 17 each member of one of the club.
Given -
5 - Drama club
4 - Chess club

so we don't know about remaining 8 students.
Question - ways in which we can for a team of 3 so no 2 students of same club are there

if we know somehow about the grouping of remaining 8 students like which club they belong to we can ans the question.

S1 -> 3 - Robotics and 2 Art Club This leaves us with 3 more students about whom we don't know. - not sufficient
S2 -> So one club has either 1 or 2 members but what about the remaining 6 or 7 students we still don't know about them - not sufficient

S1+S2 -> we know 5 drama club, 4 chess club, 3 robotics, 2 Arts club we have 3 students remaining whose clubs we don't know. But we know as per S2 just one club is there with less than 3 members so that is Arts club leaving the 3 students in one club together. So even if we don't know which club we can ans the question.

Ans - C (both together are sufficient)
Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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we are given,
total =17
drama= 5
chess=4

from statement 1 :- robotics=3
art= 2
remaining= 3, we do not know if 3 belong to 1 club or divided among some number of clubs. so NOT SUFFICIENT.

From statement 2:- different setups yield different team counts, hence NOT SUFFICIENT.

from statement 1 & 2 together:- we are sure that remaining 3 members will form 1 club, because each club size is unique, we can calculate the no. of ways to form 3 member as stated in question. BOTH TOGETHER ARE SUFFICIENT.
Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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17 students with detail
- 5 in D
- 4 in C

Q: # of ways to form 3-student team with no 2-team members from the same club
In order to solve this, we need to know
1. # of club and # of its members from each club
2. we need to still find out 17-9= 8 other students belong to which group?

Statement 1 - 3 in R, 2 in A
Meaning we still need to find out 8-5=3 students
There are 2 probabilities
- all 3 in the same club
- 2 in 1 club, and 1 in 2nd club, or the other way around
- 1 in 1st club, 1 in 2nd club, and 1 in 3rd club

So, 1. it is insufficient to answer the question because there are still 3 different answers.

Statement 2 - exactly 1 club by fewer than 3 students
Meaning, 1 club has either 1 or 2 students.

If 1 student for 1 club
then, 8-1 = 7 students other in other clubs
If assign this 7 to group of 3 -> 7/3 = there would be remained 1

If 2 students for 1 club
then 8-2 = 6 students other in other clubs
If assign these 6 to group of 3 -> 6/3 = there would be 2 ways of it

So, 2 is insufficient

If combining 1+2, then
8 students break into
- 3 in Robotic
- 2 in Arts
- 2+1 = 3 in other club

So we can calculate # of ways by multiplying all the groups members: 5*4*3*3*2

So, 1+2 is sufficient (C)



Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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We know atleast 3 clubs,
DC=5
CC=4

Evaluating st.1 alone.
RC=3
AC=2
.: We still do not whether the remaining 3 students are from existing groups or 1/2/3 different groups.
.: St 1 is not sufficient.
Remaining option choice B,C & E.

Evaluating st.2 alone.
we know there is 8 more students left.
considering this constraint,
the combinations can be,
6+2 or 3+3+2
.: St. 2 alone is not sufficient.
Remaining options, C or E.

Considering both the constraints together.
AC=2 is the only group with fewer than 3.
DC=5, CC=4, RC=3, AC=2
.:Remaining 3 students has to be in one group.
.: Both combing we can answer.

.:C is the correct answer.




Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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IMO : C
Both together are sufficient and neither alone is enough
statement 1 :
drama = 5
chess = 4 robot = 3
art =2
total = 14
so there are 17 -14 = 3 volunteers left
case 1: one club of 3
case 2 : 3 club of 1 each
with both we get different answers therefore not enough

statement 2 :
exactly one club has fewer than 3 volunteers -- again not enough

statement 1 + 2 :
3 clubs of size : 5,4,3,2 ( rem 3 volunteers)
exactly one club has fewer than 3 volunteers
so the club size are uniquely 5,4,3,3,2
sufficient
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Answer: C Both together.

We have 17 students total, and in order to calculate the number of ways a 3-person team can be formed such that no two students are in the same club, we must know:

How many students belong to each distinct club.

We are given that the first nine students represent two different clubs (5 and 4 respectively). That leaves 8 unaccounted for.

1) This provides info for 5 additional students representing 2 different clubs. However, the breakdown of the 3 remaining students is unknown. They could each belong to the same club, or they could each belong to a different club, which would change the answer.

2) This tells us that only one club had less than 3; so out of our remaining 8, we could have the following breakdowns:

1, 7 OR 2, 3, 3.

Since there could be 2 or 3 extra clubs, we cannot get a single final answer. NS.

1+2): Now with the restriction, we know that the final 3 not noted in the first statement must be a single club due to the restriction in statement 2. Therefore, the club sizes are: 5, 4, 3, 2, and 3.

This allows us to find the answer. C.
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17 students

number of clubs >= 3
drama = 5 students
chess = 4 students

3-student team with students from different clubs

Possible teams depends on the number of clubs and the number of students of each club.

(1)
robotics = 3
art = 2

drama+chess+robotics+art=5+4+3+2=14
17-14 = 3 remaining students

If the remaining 3 students are in one club then the number of clubs will be 5.
If the remaining 3 students are 3 different clubs then the number of clubs will be 7.

Different answers

Insufficient

(2)
drama+chess=9
17-9 = 8 remaining students

They can be distributed in 2 different clubs (6 and 2 students) or in 3 different clubs (3, 3 and 2 students).

Different answers

Insufficient

(1) + (2)
The club with fewer than 3 volunteers is art club (2).

The 3 remaining students are in one new club.

There are 5 clubs with (5,4,3,3,2) students, that can be combined in 5C3=10 ways.

For each way, you need to multiply the number of elements from the three chosen clubs to find the number of possible distinct teams.
Then, you add them all up to get the answer to the number of teams.
However, performing that entire calculation is not necessary to answer this DS question.

Sufficient

IMO C
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(1) d = 5, c = 4, r = 3, a = 2

used = 14, so 3 ppl left.

they could be 3 from 1 club, or split among diff clubs. no. of teams changes

ns

(2) exactly 1 club has fewer than 3 ppl

possible club sizes for remaining 8 include

2, 3, 3
or 1, 3, 4
or 2, 6

no. of teams changes

ns

together

art already has 2 ppl, so it must be the only club with fewer than 3

the last 3 ppl must all belong to 1 new club

club sizes are fixed: 5, 4, 3, 2, 3

so exact no. of teams can be found.

ans: c

Bunuel
At a school festival, 17 students volunteered to lead activity booths. Each volunteer represented exactly one school club, and the volunteers represented at least 3 clubs. Among the volunteers, 5 represented the Drama Club and 4 represented the Chess Club. If a 3-student team is to be formed so that no two team members represent the same club, in how many ways can the team be formed?

(1) Among the 17 volunteers, 3 represented the Robotics Club and 2 represented the Art Club.
(2) Among the 17 volunteers, exactly one club was represented by fewer than 3 volunteers.


 


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Each volunteer represents exactly one school club:Chess, Drama, etc.
There are at least 3 school clubs
Drama= 5 Student
Chess= 4 Student
Questions asks us how to create a 3 student team with no two student from same club (Combinatorics)
We actually don't need to do combination. All we need to find is how many more clubs are there and how many student each has.
S1: Robotic= 3 Student & Art= 2 student -- No information about remaining other clubs and volunteer numbers
S2: Exactly one club has less than 3 students as volunteer but not information about other clubs and volunteer numbers
Both S1 and S2: Robotic=3 Art=2 Drama=5 Chess 4. 3 Students left behind and since only 1 club has less than 3 volunteers there is one more club which has 3 student volunteers. Now we know all the clubs and volunteer numbers so we can calculate the combination of 3 student team
Ans. C
IMO
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Drama Club: 5
Chess Club: 4

The number of possible 3-student teams depends on how many clubs exist and their sizes.
Different number of clubs gives different answer.

(1)
Assigned students: 5+4+3+2=14
Unassigned students: 17-14=3

There is more than one possibility for assigning these 3 students: one club (3), two clubs (2,1) or three clubs (1,1,1).

Condition insufficient

(2)
Assigned students: 5+4=9
Unassigned students: 17-9=8

There is more than one possibility for assigning these 8 students: two clubs (6,2), three clubs (3,3,2).

Condition insufficient

(1)+(2)
Art Club has 2 students so there must be a new club with 3 students.

There are 5 clubs with 5, 4, 3, 3 and 2 students.

Knowing the number of clubs and the number of students in each club, we can calculate the number of teams.

Conditions sufficient

Answer C
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It is given that ->
A) Total volunteers = 17
B) Each volunteer - exactly one club
C) A team of 3 students must not have 2 members from the same club
D) Clubs - Drama - 5 Volunteers, Chess - 4 Volunteers, Remaining = 17-5-4 = 8

Question - exact number of ways to form 3-student team

Statement 1 - Out of 17 Volunteers, 2 - Arts and 3 - Robotics
Remaining as per Question above = 8
Given data = 5
Hence we are not sure of the club of remaining 3 members
Hence this statement is not sufficient

Statement 2 - Exactly 1 club was represented by less than 3 members
Again the remaining 8 can be distributed with multiple possibilities and hence this statement is also not sufficient

Combined Statement - Drama = 5, Chess = 4, Arts = 2, Robotics = 3 and hence the remaining participate in new club since a club with exactly less than 2 members is already present and hence we have the club sizes

Accordingly, the correct answer is Option C
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Total volunteers = 17
1 volunteer = 1 school club
1 volunteer = at least 3 clubs
Drama club = 5, and chess club = 4
Volunteers left = 17 - 9 = 8

S1: Robotics = 3, Art = 2, Total volunteers in 4 clubs = 5 + 4 + 3 + 2 = 14
We do not know how many clubs are left. Also, the 3 volunteers can go to either of the clubs in different ways, such as 1 in each club, or 2 in either of the clubs, and 1 in a different club and 3 volunteers in 1 group. Since the answers are different. Insufficient.

S2: Exactly one club has fewer than 3 volunteers. It can be 2 or 1.
Since there are 8 volunteers left, it can go to
Drama (7) + Chess (1)
Dram (6) + Chess (2)
Drama (4) + Robotics (3) + Chess (1)
Drama (3) + Robotics (3) or Art club (3) + Chess (2)

Different options. Insufficient.

(1) + (2) From statement 1, we have 3 volunteers left. From statement 2, 1 club has fewer than 3 volunteers.
Therefore, Drama (5), Chess (4), Robotics (3), Art (2), Another club (3). So, only 1 club has fewer than 3 volunteers. Sufficient.

Answer: (C)
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drama_club=5
chess_club=4

(1)
robotics_club=3
art_club=2

5+4+3+2=14
17-14=3

These 3 students can represent 1, 2 or 3 new clubs: [3], [1,2], [1,1,1]

Different club-size distributions produce different numbers of teams.

Condition (1) is insufficient

(2)
5+4=9
17-9=8

These 8 students can represent 2 or 3 new clubs: [1,7], [2,6], [1,3,4], [2,3,3]

Different club-size distributions produce different numbers of teams.

Condition (2) is insufficient

(1)+(2)
The only possible distribution is 5 clubs with [5,4,3,3,2] students.

An unique club-size distribution produces an unique answer.

Condition (1) and (2) are sufficient

The answer is C
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1) We know the club sizes are 5, 4, 3, and 2, with 3 volunteers left over.

Those 3 could be all in one club or split across multiple clubs, giving different numbers of valid teams.

Not sufficient.

(2) We only know one club has fewer than 3 volunteers.

There are still many possible club distributions, so the number of teams is not fixed.

Not sufficient.

(1) + (2)

Art has 2 volunteers, so it must be the only club with fewer than 3 volunteers. Hence remaining 3 volunteers to belong to one club.

The club sizes are: 5, 4, 3, 2, 3.

Sufficient.

Option C
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There are 17 students, 5 in Drama Club and 4 in Chess Club

3-student teams?

The number of valid teams depends on the distribution of students among the clubs.
If the number of clubs is different, the number of teams is different.

(1)
3 in Robotics Club and 2 in Art Club

17 students - (5 + 4 + 3 + 2) = 3 students

One more club (with 3 students) or three more clubs (with 1 student each one) can be formed with these 3 students.

insufficient

(2)
17 students - (5 + 4) = 8 students

Two more clubs (with 7 and 1 students) or three more clubs (with 3, 3, and 2 students) can be formed with these 8 students.

insufficient

(1) and (2)
Only one option is possible, that the 3 students be in a new club.

There are 5 clubs with 5, 4, 3, 3, and 2 students.

Once the number of clubs and the number of students in each club are established, the number of teams can be calculated.

sufficient

The correct answer is C
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17 volunteers in total , at least 3 clubs
Drama = 5, Chess - 4
So for 8 volunteers we do not know the distribution

Unless we can get the distribution for these 8, we cannot get the combinations

Statement A

Robotics = 3, Art = 2
We still have 3 Volunteers whose clubs are not determined. This statement alone does not solve the number of combinations

Statement B

Exactly 1 club has less than 3 Volunteers
Drama and Chess already have more than 3
So the remaining 8 can be distributed in any number of ways such that 1 club has less than 3
For example 7 + 1, 6 + 2, 3 + 3 +2
So even this statement cannot give us the number of combinations

Combining both statements

We have 5 in Drama, 4 in Chess, 3 in Robotics, 2 in Art. This leaves 3 remaining. But from statement B, only one club has less than 3 => that club is Art. and the remaining 3 will be in any other one club

This solves the combinations of the volunteers distribution and we can calculate the number of ways the team can be formed.

Answer C
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