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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

`2//3`

B

`1//2`

C

`1//3`

D

`1//4`

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The correct Answer is:
C
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