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Of the 66 people in a certain auditorium, at most 6 people [#permalink]
 16 Jul 2012, 04:49
Question Stats:
51% (01:37) correct
48% (01:03) wrong based on 1 sessions
The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions ProjectOf the 66 people in a certain auditorium, at most 6 people have their birthdays in anyone given month. Does at least one person in the auditorium have a birthday in January? (1) More of the people in the auditorium have their birthday in February than in March. (2) Five of the people in the auditorium have their birthday in March. Diagnostic Test
Question: 45
Page: 26
Difficulty: 650 GMAT Club is introducing a new project: The Official Guide for GMAT® Review, 13th Edition - Quantitative Questions ProjectEach week we'll be posting several questions from The Official Guide for GMAT® Review, 13th Edition and then after couple of days we'll provide Official Explanations (OE) to them along with an alternate approaches if necessary. We'll be glad if you participate in development of this project: 1. Please provide your solutions to the questions; 2. Please vote for the best solutions by pressing Kudos button (the best solution we'll be put along the OE in the second post); 3. Please vote for the questions themselves by pressing Kudos button; 4. Please share your views on difficulty level of the questions, so that we have most precise evaluation. Thank you! _________________
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
16 Jul 2012, 13:08
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SOLUTIONOf the 66 people in a certain auditorium, at most 6 people have their birthdays in anyone given month. Does at least one person in the auditorium have a birthday in January?Basically the question is whether we can distribute 66 birthdays between 12 moths so that January to get 0. (1) More of the people in the auditorium have their birthday in February than in March. Let 10 months (except March and January) have 6 birthdays each (maximum possible) --> 6*10=60. As in March there was less birthdays than in February than maximum possible for March is 5 --> total 60+5=65, so even for the worst case scenario (maximum for other months) still 1 birthday (66-65=1) is left for January. Sufficient. (2) Five of the people in the auditorium have their birthday in March. Again: let 10 months have 6 birthdays each (maximum possible) --> 6*10=60 + 5 birthdays in March = 65. The same here: even for the worst case scenario (maximum for other months) still 1 birthday (66-65=1) is left for January. Sufficient. Answer: D. Hope it helps.
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
16 Jul 2012, 19:43
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Assume that January has 0 birthdays => all other months have 6 birthdays to total 66.
Statement 1: "More of the people in the auditorium have their birthday in February than in March" => March needs to be less than February, say March has 5 so that March (5) < February (6). The one birthday which has been 'plucked' from March, can only be accommodated in January since all other months are maxed out. => Jan has atleast one. Sufficient.
Statement 2: "Five of the people in the auditorium have their birthday in March" - same logic as for statement 1. Sufficient.
Answer: (D)
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
16 Jul 2012, 19:46
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Q is does any one have their b'day in jan
given: max people(with their b'day) in any given month is 6. no of people is 66 .
stmt 1 : no of people in feb > no of people in march
lets consider the number of b'day people in feb as 6 (max)
so no of people in march cud be 5 or 4 or 3 or 2 or 1 or 0 . now max total is (6 in feb) + (5 in march) = 11 (66-11=55)
other remaining months from april to december can hold max 6 people each which means 6 * 9 = 54 people covered.
and only one person remaining out of 55 who fits into jan. therby atleast 1 person's b'day is in jan.
sufficient
stmt 2 : no of people having bday in march is 5
so 66-5 = 61.
no of months other than march and jan is 10 . so considering each months holds max of 6 . (10 * 6 = 60)
remaining 1 left who cud be in jan.
sufficient
IMO D
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
17 Jul 2012, 02:52
lateapp wrote: Assume that January has 0 birthdays => all other months have 6 birthdays to total 66.
Statement 1: "More of the people in the auditorium have their birthday in February than in March" => March needs to be less than February, say March has 5 so that March (5) < February (6). The one birthday which has been 'plucked' from March, can only be accommodated in January since all other months are maxed out. => Jan has atleast one. Sufficient.
Statement 2: "Five of the people in the auditorium have their birthday in March" - same logic as for statement 1. Sufficient.
Answer: (D) Agreed. In order for for there to be no January birthdays, Feb-Dec must each have 6. Statements to the contrary answer the question.
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
18 Jul 2012, 00:41
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Any month can have a max of 6 people celebrating their birthdays. No information is given about the min people or a lower cap of people.
(1)Feb>Mar implies that it can be a combination of any of the following.
Feb,Mar : 1,0 ; 2,0 ; 2,1 ; 3,0 ; 3,1 ; 3,2 and so on.
No information is given about the other 10 months. We cannot simply populate the values for the other 10 months with just the cap for the maximum number of birthdays.(Although a minimum number would have been useful in this regard)
NOT SUFFICIENT
(2)5 people have their birthdays in March. This does not give any information about the other months. Combining with the information given in the question, we can say that the condition has not been violated.
NOT SUFFICIENT
(1&2) Imply that Feb has 6 birthdays. Still we do not have information about the other months. 66-(6+5) = 55 member can have their birthdays distributed in 10 months in any number of ways as long as any of the remaining months do not exceed 6 birthdays. No information on the number of birthdays in Jan.
NOT SUFFICIENT
Hence 'E' must be the solution.
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Re: Of the 66 people in a certain auditorium, at most 6 people [#permalink]
20 Jul 2012, 04:03
SOLUTIONOf the 66 people in a certain auditorium, at most 6 people have their birthdays in anyone given month. Does at least one person in the auditorium have a birthday in January?Basically the question is whether we can distribute 66 birthdays between 12 moths so that January to get 0. (1) More of the people in the auditorium have their birthday in February than in March. Let 10 months (except March and January) have 6 birthdays each (maximum possible) --> 6*10=60. As in March there was less birthdays than in February than maximum possible for March is 5 --> total 60+5=65, so even for the worst case scenario (maximum for other months) still 1 birthday (66-65=1) is left for January. Sufficient. (2) Five of the people in the auditorium have their birthday in March. Again: let 10 months have 6 birthdays each (maximum possible) --> 6*10=60 + 5 birthdays in March = 65. The same here: even for the worst case scenario (maximum for other months) still 1 birthday (66-65=1) is left for January. Sufficient. Answer: D. Hope it helps.
_________________
PLEASE READ AND FOLLOW: 11 Rules for Posting!!!
RESOURCES: [GMAT MATH BOOK]; 1. Triangles; 2. Polygons; 3. Coordinate Geometry; 4. Factorials; 5. Circles; 6. Number Theory
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. NEW!!!
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. NEW!!!
What are GMAT Club Tests?
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Re: Of the 66 people in a certain auditorium, at most 6 people
[#permalink]
20 Jul 2012, 04:03
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