Sat. or Sun.

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harsh.champ: Legendary Member; Posts: 1132; Joined: Mon Jul 20, 2009 3:38 amFollowed by: 6 members; Location: India; Thanked: 64 times; GMAT Score:760

by harsh.champ » Wed Feb 17, 2010 5:51 am

Find the probability of birthday of a child is on a Saturday or Sunday(Assuming 365 days in a year)

A. 1/7
B. 2/7
C. 1/365
D. 2/365
E. None of the above.

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Source: Beat The GMAT — Problem Solving | Wed Feb 17, 2010 5:51 am

ajith: Legendary Member; Posts: 1275; Joined: Thu Sep 21, 2006 11:13 pmFollowed by: 2 members; Location: Arabian Sea; Thanked: 125 times

by ajith » Wed Feb 17, 2010 6:02 am

harsh.champ wrote:Find the probability of birthday of a child is on a Saturday or Sunday(Assuming 365 days in a year)

A. 1/7
B. 2/7
C. 1/365
D. 2/365
E. None of the above.

If we are not referring to years and consider it the probability is 2/7

But if we are asking about a specific year then we cannot determine because then we need to know how many saturdays and sundays were there in that year. (It can be 102/365 or 103/365)

Always borrow money from a pessimist, he doesn't expect to be paid back.

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