Question

A coin is tossed until a head appears. what is the expectation of the number of tosses required

Answer 1

A coin has two sides head and tail so there is 1/2 chance of getting head 
Means 2 time we need to toss

Answer 2

Answer :

When a coin is tossed, we get two events

= {H, T}

So, n(S) = 2

To get a head, n(A) = 1

Thus, the probability is

= n(A)/n(S)

= 1/2

To get a head for sure, we need to perform 2 tosses as (2 × 1/2) = 1.

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