What is the chance that a leap year,selected at random,will contain $53$ Sundays (in $/7$)?

From a pack of $52$ cards,two cards are drawn in succession one by one without replacement. The probability that both are aces is

$A$ can hit a target $4$ times in $5$ shots,$B$ can hit a target $3$ times in $4$ shots,and $C$ can hit a target $2$ times in $3$ shots. All three fire a shot each. What is the probability that at least two shots hit the target?

From a class of $12$ girls and $18$ boys,two students are chosen randomly. What is the probability that both of them are girls?

$A$ person can kill a bird with a probability of $3/4$. He tries $5$ times. What is the probability that he may not kill the bird at all (in $/1024$)?

Three dice are thrown simultaneously. What is the probability of obtaining a total of $17$ or $18$?