Let $S$ be a set containing n elements and we select $2$ subsets $A$ and $B$ of $S$ at random then the probability that $A \cup B = S$ and $A \cap B = \phi $ is
${2^n}$
${n^2}$
$1/n$
$1/{2^n}$
If the odds against an event be $2 : 3$, then the probability of its occurrence is
A card is drawn from a pack of cards. Find the probability that the card will be a queen or a heart
If odds against solving a question by three students are $2 : 1 , 5:2$ and $5:3$ respectively, then probability that the question is solved only by one student is
If $A$ and $B$ are two events such that $P\left( {A \cup B} \right) = P\left( {A \cap B} \right)$, then the incorrect statement amongst the following statements is
Two dice are thrown simultaneously. The probability that sum is odd or less than $7$ or both, is