Fill in the blank in the following table:

$P(A)$	$P(B)$	$P(A \cap B)$	$P(A \cup B)$
$0.35$	$..........$	$0.25$	$0.6$

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

One card is drawn from a pack of $52$ cards. The probability that it is a queen or a heart is

The probability that a leap year selected at random contains either $53$ Sundays or $53$ Mondays is:

If the odds against solving a question by three students are $2:1$,$5:2$,and $5:3$ respectively,then the probability that the question is solved by only one student is

The probability that a student will succeed in the $IIT$ entrance test is $0.2$ and the probability that he will succeed in the Roorkee entrance test is $0.5$. If the probability that he will be successful at both places is $0.3$,then the probability that he does not succeed at either place is: