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

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

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

Find the probability distribution of the number of heads when three coins are tossed. Also find the mean number of heads in the above case.

Find the Probability distribution of the number of heads when three coins are tossed.

Find the probability distribution of number of tails in four tosses of a coin.

Find the probability distribution of number of tails in the simultaneous tosses of three coins.