coin

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Wed Jun 10, 2009 3:02 am

A coin is tossed 3 times. What is the probability that it will be up with the same side in all the 3 times?

[spoiler]please explain how answer is ¼..[/spoiler]

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Source: Beat The GMAT — Problem Solving | Wed Jun 10, 2009 3:02 am

sacx: Master | Next Rank: 500 Posts; Posts: 139; Joined: Wed Oct 22, 2008 4:36 am; Thanked: 17 times

by sacx » Wed Jun 10, 2009 3:11 am

you have already posted this ques

https://www.beatthegmat.com/coin-t38336.html

SACX

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ketkoag: Legendary Member; Posts: 876; Joined: Thu Apr 10, 2008 8:14 am; Thanked: 13 times

by ketkoag » Wed Jun 10, 2009 3:16 am

ohh, i'm sorry..

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sreak1089: Master | Next Rank: 500 Posts; Posts: 379; Joined: Wed Jun 03, 2009 3:05 amFollowed by: 1 member; Thanked: 19 times; GMAT Score:690

by sreak1089 » Wed Jun 10, 2009 3:17 am

When 3 coins tossed, It can happen in two ways all HHH or all TTT out
of 8 possibilities ==> 2/8 = 1/4

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