probability

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faraday88: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Fri May 18, 2012 6:26 am

by faraday88 » Wed Aug 15, 2012 10:44 am

Three coins are tossed. Find the probability that they all land heads up given that at least one coin shows a head.
Is answer 1/7?

Source: Beat The GMAT — Problem Solving | Wed Aug 15, 2012 10:44 am

cypherskull: Senior | Next Rank: 100 Posts; Posts: 94; Joined: Sat Mar 31, 2012 3:39 am; Location: Calcutta; Thanked: 8 times

by cypherskull » Wed Aug 15, 2012 10:56 am

Can u please post the answer choices given?

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Sunit

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rijul007: Legendary Member; Posts: 588; Joined: Sun Oct 16, 2011 9:42 am; Location: New Delhi, India; Thanked: 130 times; Followed by:9 members; GMAT Score:720

by rijul007 » Wed Aug 15, 2012 1:06 pm

H H T
H T H
T H H
H T T
T H T
T T H
H H H

Total number of cases = 7
Probability = 1/7

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