Homework Help: math

Posted by jess on Sunday, September 6, 2009 at 9:37pm.

What are the odds in favor of getting at least one head
in three successive flips of a coin?

math - bobpursley, Sunday, September 6, 2009 at 10:05pm
1/2 * 1/2 * 1/2
math - bobpursley, Sunday, September 6, 2009 at 10:06pm
ooops, I misread. One head in three tries, so there are three ways
HTT
THT
TTH

So it is 3*1/2*1/2*1/2
math - Reiny, Sunday, September 6, 2009 at 11:08pm
The prob of at least one head with 3 coins
= 1 - 1/8
= 7/8
(I excluded the case of all tails)

so the odds in favour of at least one head
= (7/8):(1/8)
= 7:1

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