Find the probability of getting 2 or 3 tails when a coin is tossed four times.

Find the probability of getting a head when a coin is tossed once. Also find the probability of getting a tail.

A box contains N coins, m of wiich are fair and the rest are biased. The probability of getting a head when a fair coin is tossed is 1/2, while it is 2/3 when a biased coin is tossed. A coin is drawn from the box at random and is tossed twice. The first time it shows head and the second time it shows tail. What is the probability that the coin drawn is fair ?

In a toss of two coins, find the probability of getting both heads or both tails.

The probability of getting at least one tail in 4 tosses of a coin is:

Three coins are tossed. Find the probability of getting : at least one head and one tail.

Find the probability of not getting a pair of heads in a simultaneous toss of two coins.

Find the probability of not getting a pair of heads in a simultaneous toss of two coins.

The probability of getting exactly two heads when tossing a coin three times is

Using binomial distribution find the probability of obtaining "less than 3 heads" when an unbiased coin is tossed 6 times.

Find the probability distribution of the number of tails when two coins are tossed.