A coin is tossed until a head appears or it has been tossed 3 times. Given that head doesn't appear on the first toss, the probability that coin is tossed 3 times is

A biased coin is tossed repeatedly until a tail appears for the first time. The head is 3 times likely to appear as the tail. The probability that the number of tosses required will be more than 4, given that in first two toss no tail has occur, is

A coin is tossed 40 times and head appears 25 times. What is the probability of getting a tail.

A bag contains a fair coin X and a two headed coin Y. A coin is selected at random and tossed twice. (i) If heads appears both times find the probability that the coin is two headed. (ii) If tails appears both times, find the probability that the coin is two headed.

A fair coin is tossed repeatedly.If tail appears on first four tosses,then find the probability of head appearing on fifth toss.

A fair coin is tossed repeatedly. If the tail appears on first four tosses, then the probability of the head appearing on the fifth toss equals

A fair coin is tossed repeatedly. If tail appears on first four tosses, them the probability of head appearing on fifth toss equals is