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A fair coin is tossed 5 times.What is the probability that

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Senior Manager
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A fair coin is tossed 5 times.What is the probability that [#permalink] New post 13 Oct 2006, 13:23
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E

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A fair coin is tossed 5 times.What is the probability that it lands heads up at least twice?

A) 1/16
B) 5/16
C) 2/5
D)13/16
E) 27/32
Senior Manager
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 [#permalink] New post 13 Oct 2006, 13:27
it is D.

heads Atleast twice = 1 - no heads - exactly one head
= 1- 5C0/32-5C1/32 = 1-6/32 = 26/32 = 13/16

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 [#permalink] New post 17 Oct 2006, 01:23
It is B...

Total number of choices: 2*2*2*2*2=32

Number of ways to select 2 heads out of 5 times: 5C2=10

Probability: 10/32=5/16.....
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 [#permalink] New post 17 Oct 2006, 01:33
I agree with Cicerone:

No heads : TTTTT = 1/2^5 = 1/32
1 head : 5 ways of getting 1 head = 5*1/32

1 - 6/32 = 26/32 = 13/16

D
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 [#permalink] New post 17 Oct 2006, 01:36
On the second thought i have to learn read questions :)

Of course it is the cicerone's way.....
  [#permalink] 17 Oct 2006, 01:36
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