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A fair coin is tossed five times.  What is the probability that heads appears at least once?

 May 23, 2020
 #1
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Probability of at least 1 head =[5C1 + 5C2 +5C3 + 5C4 + 5C5] =31 / 2^5 =31 / 32

 May 24, 2020
 #2
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A fair coin is tossed five times.  What is the probability that heads appears at least once?

 

First find the probability heads doesn't appear at all:  pno_heads = (1/2)5

 

So:   pat_least_one_head = 1 - pno_heads

 May 24, 2020

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