In a simultaneous throw of three coins,what is the probability of getting at least $2$ tails?

$A$ coin is tossed twice. What is the probability that at least one tail occurs?

$X$ speaks truth in $60\%$ and $Y$ in $50\%$ of the cases. The probability that they contradict each other in narrating the same incident is

In a single throw of two dice,what is the probability of getting a total of $13$?

Three unbiased coins are tossed. Then,the probability of getting at most two heads is

Two players play the following game: $A$ writes $3, 5, 6$ on three different cards; $B$ writes $8, 9, 10$ on three different cards. Both draw randomly two cards from their collections. Then,$A$ computes the product of the two numbers he/she has drawn,and $B$ computes the sum of the two numbers he/she has drawn. The player getting the larger number wins. What is the probability that $A$ wins?