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How many different sequences of ten flips of a coin have at least 8 heads?

 Oct 19, 2018
 #1
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Flip the coin 10 times...let any 8 outcomes be heads  = C(10,8)  = 45  sequences

 

Flip the coin 10 times, let any 9 outcomes  be heads = C (10,9)  = 10  sequences

 

Let all 10 outcomes be heads  = 1  sequence

 

So.... 45 + 10 + 1  =  56 sequences

 

 

cool cool cool

 Oct 19, 2018
edited by CPhill  Oct 19, 2018

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