probability

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srivathsan: Newbie | Next Rank: 10 Posts; Posts: 8; Joined: Sat Aug 25, 2012 9:43 pm

by srivathsan » Sat Sep 08, 2012 7:24 am

In a group of 8 persons what is the probability that at least teo of them are boen on the same day of the week?

a.1/8
b.1/7
c.1/4
d.1/2
e.1

Kindly post ur reply

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Source: Beat The GMAT — Problem Solving | Sat Sep 08, 2012 7:24 am

neelgandham: Community Manager; Posts: 1060; Joined: Fri May 13, 2011 6:46 amFollowed by: 52 members; Location: Utrecht, The Netherlands; Thanked: 318 times

by neelgandham » Sat Sep 08, 2012 8:43 am

My 1000th Post - yay yay! Let A,B,C,D,E,F,G and H be the members of the group. Let us distribute evenly as shown below

Sunday - A
Monday - B
Tuesday - C
Wednesday - D
Thursday - E
Friday - F
Saturday - G

and H should be born on any of these days. So the probability that at least TWO of the group members are born on the same day of the week is 1.

Correct me if I am wrong.

p.s: I S**k at Probability anyway

Anil Gandham
Welcome to BEATtheGMAT | Photography | Getting Started | BTG Community rules | MBA Watch
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