Two coins A and B have probability of head coming up in a single a toss and respictively. One of the coins is selected at random and tossed twice. If two heads come up. What is the probability that the coin B was tossed?

Two coins A and B have probabilities of head 1/4 and 3/4 in a single toss respectively. One of the coins is selected at random and tossed twice. If two heads come up what is the probability that coin B was tossed?

A coin is tossed twice, what is the probability that atleast one tail occurs?

There are two coins, one unbiased with probability 1/2 of getting heads and the other one is biased with probability 3/4 of gatting heads. A coin is selected at random and tossed.It shows heads up. Then the probability that the unbiased coin was selected is-

4 coins are tossed at a time. What is the probability that there are 2 heads and 2 tails?

There are three coins. One is two headed coin, another is a biased coin that comes up head 75% of the time and third is an unbiased coin. One of the three coins is chosen at random and tossed. If it shows head, what is the probability that it was the two headed coin ?

There are three coins, One is two headed coin, another is a biased coin that comes up head 75% of the time and thrid is an unbaised coin. One of the three coins is chosen at random and tossed. If its hows head, what is the probability that it was the two headed coin?

There are 3 coins in a box. The probability of getting head is (2)/(3) for two of them, while for remaining it is (1)/(2) . A coin is chosen at random and tossed 3 times, showing head in each case. What is the probability that the coin is unbiased ?

Find the probability of getting at least one tail in 4 tosses of a coin.

Three Coins are tossed: What is the probability of getting at least one tail?