The probability of at least one of the events $A$ and $B$ occurring is $0.6$. If the probability of both $A$ and $B$ occurring simultaneously is $0.3$,then $P(A') + P(B') = \dots$

The probability of getting a total of $5$ or $6$ in a single throw of $2$ dice is

The probability of obtaining an even prime number on each die,when a pair of dice is rolled,is . . . . . . .

Three coins are tossed once. Let $A$ denote the event 'three heads show',$B$ denote the event 'two heads and one tail show',$C$ denote the event 'three tails show' and $D$ denote the event 'a head shows on the first coin'. Which events are compound?

The chances to fail in Physics are $20\%$ and the chances to fail in Mathematics are $10\%$. What are the chances to fail in at least one subject? ............ $\%$

Two cards are drawn from a pack of $52$ cards. What is the probability that both cards are red or both cards are kings?