A box contain three coins: one coin is fair, one coin is two-headed, and one coin is weighted so that the probability of heads, appearing is `1/3`. A coin is selected at random and tossed. Then the probability that heads appears is

Three coins are tossed .Find the probability of heads .

If a coin is tossed four xx then the probability that head appears at least once is

Three coins are tossed .Find the probability of no heads .

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

Two coins are tossed , then the probability that at least one head turns up is ………..

A coin is tossed two times. Find the probability of getting atmost one head.

A coin is weighted so that head is twice as likely lito appear as tail.When such a coin is tossed once the probability of getting tail is

A bag contains n+1 coins.If is known that one of these coins shows heads on both sides, whereas the other coins are fair.One coin is selected at random and tossed.If the probability that toss results in heads is 7/12, then find the value of n.