The probability of an event $A$ happening in one trial is $0.4$. The probability that the event $A$ happens at least once in three independent trials is

In a simultaneous toss of $2$ coins,find the probability of getting no tail.

The probability of an event $A$ occurring is $0.5$ and that of $B$ is $0.3$. If $A$ and $B$ are mutually exclusive events,find the probability that neither $A$ nor $B$ occurs.

The probability of hitting a target by three marksmen are $\frac{1}{2}, \frac{1}{3}$ and $\frac{1}{4}$ respectively. The probability that one and only one of them will hit the target when they fire simultaneously,is

$A$ basket contains $3$ blue and $4$ red balls. If $3$ balls are drawn at random from the basket,then what is the probability that all the $3$ are either blue or red?

Two cards are drawn from a pack of $52$ cards. What is the probability that at least one of the cards drawn is an ace?