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An unbaised coin is thrown 5 times. Let ...

An unbaised coin is thrown 5 times. Let X be a random variable and k be the value of assigned to X for k=3,4,5 times Head occurs consecutively and otherwise the value of X is assigned -1. What is value of expection.

A

`1/8`

B

`-3/16`

C

`-(1)/(8)`

D

`(3)/(16)`

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