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A coin is biased so that head is 3 times...

A coin is biased so that head is 3 times as likely to occur as tail. this coin is tossed until a head or tree tails occur . If X denotes the number of tosses of the coin then the mean of X is .

A

`(15)/(16)`

B

`(21)/(16)`

C

`(81)/(64)`

D

`(37)/(16)`

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