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 baised coin with probability p, 0lt p lt 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 is equal to

A biased coin with probability P,(0 lt p ,1) of heads is tossed until a head appear for the first time. If the probability that the number of tosses required is even is 2/5 then p=

A biased coin with probability P,(0

A biased coin with probability p(0 lt plt 1) of falling tails is tossed until a tail appears for the first time. If the probability that tail comes in odd number of trials is (2)/(3) , then p equals

A biased coin with probability p(0 lt plt 1) of falling tails is tossed until a tail appears for the first time. If the probability that tail comes in odd number of trials is (2)/(3) , then p equals

A biased coin with probability p(0 lt plt 1) of falling tails is tossed until a tail appears for the first time. If the probability that tail comes in odd number of trials is (2)/(3) , then p equals