Posted by **Aleah** on Friday, October 9, 2009 at 10:11pm.

This is a confusing problem to me also, can someone please help me?

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

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**bobpursley**, Friday, October 9, 2009 at 10:16pm
Pr(three heads)= 1/2*1/2*1/2

Pr(one head in three flips)= Pr(HTT)+Pr(HHT) + Pr(HHH)+ Pr(THT)+Pr(TTH)+ Pr(THH)+Pr(HTH)

= oddly enough 1/2*1/2*1/2 * 7

check me to make certain I included all the ways to get at least one head.

think on that one.

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**Lisa**, Friday, October 9, 2009 at 10:16pm
7/8

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**bobpursley**, Friday, October 9, 2009 at 10:18pm
One comment. On the at least on head in three flips should equal the 1-Pr(no heads)0r 1=Pr(TTT) or 1-1/2*1/2*1/2= 7/8

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**Lisa**, Friday, October 9, 2009 at 10:22pm
post that same question in the little jiskha box search, and you'll find what you need.

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**Aleah**, Friday, October 9, 2009 at 10:25pm
Thanks alot!!!

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**yaSmIne**, Friday, September 7, 2012 at 2:13am
0.2DiVde dy1.5

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