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A and B have less than 6 diamonds each.What is the probability

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A and B have less than 6 diamonds each.What is the probability  [#permalink]

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New post 08 Apr 2016, 21:36
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A and B have less than 6 diamonds each.What is the probability that the sum of diamonds they have is more than 3 but less than 7?

a) 3/5
b) 9/25
c) 4/9
d) 2/3
e) 3/2
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Joined: 02 Aug 2009
Posts: 7112
Re: A and B have less than 6 diamonds each.What is the probability  [#permalink]

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New post 09 Apr 2016, 00:54
theperfectgentleman wrote:
A and B have less than 6 diamonds each.What is the probability that the sum of diamonds they have is more than 3 but less than 7?

a) 3/5
b) 9/25
c) 4/9
d) 2/3
e) 3/2


First let sfind the total ways..


Since both A and B should have <6, they can have 0,1,2,3,4 or 5 so 6 ways each..
ways to choose one each = 6*6=36 ways..

Here itself we can eliminate a,b and d as the denominator has to be 36 or its factor. d has 2 but prob>1, which is not possible

lets see how the sum can be 4, 5 or 6..


1) 4
0,4 or 4,0 -2 ways
1,3 or 3,1 - 2 ways
2,2 --------- 1 way
Total - 5 ways


2) 5
0,5 or 5,0 -2 ways
1,4 or 4,1 - 2 ways
2,3 or 3,2 - 2 way
Total - 6 ways


3) 6
0,6 or 6,0 -2 ways -- NO, since we are looking for number<6
1,5 or 5,1 - 2 ways
2,4 or 4,2 - 2 way
3,3 -------- 1 way
Total - 5 ways


Total = 5+6+5 = 16 ways

so prob =\(\frac{16}{36} = \frac{4}{9}\)
C
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Re: A and B have less than 6 diamonds each.What is the probability  [#permalink]

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New post 09 Apr 2016, 00:58
theperfectgentleman wrote:
A and B have less than 6 diamonds each.What is the probability that the sum of diamonds they have is more than 3 but less than 7?

a) 3/5
b) 9/25
c) 4/9
d) 2/3
e) 3/2


A has 0, 1, 2, 3, 4, or 5 diamonds;
B has 0, 1, 2, 3, 4, or 5 diamonds.

More than 3 but less than 7 = 4, 5, or 6.

4:
{A, B}
{4, 0}
{3, 1}
{2, 2}
{1, 3}
{0, 4}


5:
{A, B}
{5, 0}
{4, 1}
{3, 2}
{2, 3}
{1, 4}
{0, 5}

6:
{A, B}
{5, 1}
{4, 2}
{3, 3}
{2, 4}
{1, 5}

Favorable = 5 + 6 + 5 = 16.
Total = 6*6 = 36

Probability = 16/36 = 4/9.

Answer: C.
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Concentration: Marketing, Operations
Re: A and B have less than 6 diamonds each.What is the probability  [#permalink]

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New post 10 Apr 2016, 08:31
theperfectgentleman wrote:
A and B have less than 6 diamonds each.What is the probability that the sum of diamonds they have is more than 3 but less than 7?

a) 3/5
b) 9/25
c) 4/9
d) 2/3
e) 3/2


Here should not the total number of possible ways in which A and B can have diamonds be 30? (0,0), (1,1)....(5,5) will be counted as one unlike (0,1) and (1,0).
Math Expert
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Joined: 02 Sep 2009
Posts: 51280
Re: A and B have less than 6 diamonds each.What is the probability  [#permalink]

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New post 10 Apr 2016, 09:09
dhananjay1702 wrote:
theperfectgentleman wrote:
A and B have less than 6 diamonds each.What is the probability that the sum of diamonds they have is more than 3 but less than 7?

a) 3/5
b) 9/25
c) 4/9
d) 2/3
e) 3/2


Here should not the total number of possible ways in which A and B can have diamonds be 30? (0,0), (1,1)....(5,5) will be counted as one unlike (0,1) and (1,0).


They ARE counted as one. If you list all possibilities you'll be able to see that.
_________________

New to the Math Forum?
Please read this: Ultimate GMAT Quantitative Megathread | All You Need for Quant | PLEASE READ AND FOLLOW: 12 Rules for Posting!!!

Resources:
GMAT Math Book | Triangles | Polygons | Coordinate Geometry | Factorials | Circles | Number Theory | Remainders; 8. Overlapping Sets | PDF of Math Book; 10. Remainders | GMAT Prep Software Analysis | SEVEN SAMURAI OF 2012 (BEST DISCUSSIONS) | Tricky questions from previous years.

Collection of Questions:
PS: 1. Tough and Tricky questions; 2. Hard questions; 3. Hard questions part 2; 4. Standard deviation; 5. Tough Problem Solving Questions With Solutions; 6. Probability and Combinations Questions With Solutions; 7 Tough and tricky exponents and roots questions; 8 12 Easy Pieces (or not?); 9 Bakers' Dozen; 10 Algebra set. ,11 Mixed Questions, 12 Fresh Meat

DS: 1. DS tough questions; 2. DS tough questions part 2; 3. DS tough questions part 3; 4. DS Standard deviation; 5. Inequalities; 6. 700+ GMAT Data Sufficiency Questions With Explanations; 7 Tough and tricky exponents and roots questions; 8 The Discreet Charm of the DS; 9 Devil's Dozen!!!; 10 Number Properties set., 11 New DS set.


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Re: A and B have less than 6 diamonds each.What is the probability  [#permalink]

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Re: A and B have less than 6 diamonds each.What is the probability &nbs [#permalink] 09 Aug 2018, 09:07
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