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Minimum of how many people are needed to have the probability of more

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Minimum of how many people are needed to have the probability of more  [#permalink]

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New post 20 Aug 2018, 05:50
10
00:00
A
B
C
D
E

Difficulty:

  55% (hard)

Question Stats:

40% (01:06) correct 60% (01:22) wrong based on 47 sessions

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GMAT CLUB TESTS' FRESH QUESTION:



Minimum of how many people are needed to have the probability of more than 1/2 that at lease one of them was born on either on Monday or on Tuesday?

A. 2
B. 3
C. 4
D. 5
E. 6

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Re: Minimum of how many people are needed to have the probability of more  [#permalink]

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New post 20 Aug 2018, 06:09
1
Bunuel wrote:

GMAT CLUB TESTS' FRESH QUESTION:



Minimum of how many people are needed to have the probability of more than 1/2 that at lease one of them was born on either on Monday or on Tuesday?

A. 2
B. 3
C. 4
D. 5
E. 6



Say there are only 2 person..
Prob = 2/7+2/7-2/7*2/7=4/7-4/49=24/49<1/2
Ans will be 3 because with 2, we had answer almost close to 1/2
No calculations required therefore
B
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Minimum of how many people are needed to have the probability of more  [#permalink]

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New post 20 Aug 2018, 06:13
chetan2u can you please explain a little bit more?

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Re: Minimum of how many people are needed to have the probability of more &nbs [#permalink] 20 Aug 2018, 06:13
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