SOLUTION: Toss a coin 4 times, what is the probability of flipping a head?

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Question 1198018: Toss a coin 4 times, what is the probability of flipping a head?
Answer by ikleyn(52781) About Me  (Show Source):
You can put this solution on YOUR website!
.

If you want to ask, what is the probability of flipping a head at least once, 

then the answer is  P = %282%5E4-1%29%2F2%5E4 = %2816-1%29%2F16 = 15%2F16.



There are 2%5E4 = 16 possible different outcomes

    HHHH
    HHHT
    HHTH
    HTHH
    . . . 

    TTTT


Of them, only one do not have H in all 4 positions: it is the outcome TTTT.

15 others have at least one H in one of 4 positions.

Answered, with explanations.