# A coin is tossed twice and the outcome is noted every time. can you say that head must come once in two tosses? justify your answer

2
by timmy

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by timmy

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{ (H,T) (H,H) (T,T) (T,H) } = 4

now the head come once in two tosses will be { (H,T) (H,H) } = 2

now the probability P = 2/4 = 0.5

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(H,T),(T,H),(H,H),(T,T) = 4

Therefore four outcomes are possible.

(H,T),(T,H),(H,H)

Here (H,H) is included because head comes atleast once in this outcome.

So the number of head once in every outcomes = 3

= 4 / 3

Therefore number of head appearing once is of probability