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

In a game, the entry fee is$₹5$. The game consists of tossing a coin $3$ times. If one or two heads show, Sweta gets her entry fee back. If she tosses $3$ heads, she receives double the entry fee. Otherwise, she will loss. For tossing a coin three times, find the probability that she just gets her entry fee.

Three different coins are tossed together. Find the probability of getting

exactly two heads.

Three different coins are tossed together. Find the probability of getting at least two heads.

Three different coins are tossed together. Find the probability of getting at least two tails.