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An unbiased coin is tossed 5 times. Supp...

An unbiased coin is tossed 5 times. Suppose that a variable `X` is assigned the value `k` when `k` consecutive heads are obtained for `k=3,4,5` otherwise `X` takes the value `-1` .Then the expected value of `X` ,is :

A

`3/16`

B

`-1/8`

C

`-3/16`

D

`1/8`

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The correct Answer is:
D
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