A biased coin with probability p, `0ltplt1` of heads is tossed until a head appears for the first time. If the probability that

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)`

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 r

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