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A biased coin with probability p, 0ltplt...

A biased coin with probability p, `0ltplt1` of heads is tossed until a head appears for the first time. If the probability that the number of tosses required is even is 2/5, then p equals

A

`(1)/(3)`

B

`(2)/(3)`

C

`(2)/(5)`

D

`(3)/(5)`

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The correct Answer is:
A
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