If $A$ and $B$ are any two events,then $P(A \cup B) = \dots$

If $A$ and $B$ are arbitrary events,then

Three critics review a book. For the three critics,the odds in favour of the book are $2:5$,$3:4$,and $4:3$ respectively. The probability that the majority is in favour of the book is given by

The probabilities of occurrence of two events are respectively $0.21$ and $0.49$. The probability that both occur simultaneously is $0.16$. Then the probability that none of the two occurs is

The probabilities of two events $A$ and $B$ occurring are $0.25$ and $0.50$ respectively. The probability of both events occurring simultaneously is $0.12$. Find the probability that neither event occurs.

$A$ card is drawn at random from a pack of $52$ cards. The probability of this card being a red card or a queen is: