Twelve tickets are numbered $1$ to $12$. One ticket is drawn at random, then the probability of the number to be divisible by $2$ or $3$, is
$\frac{2}{3}$
$\frac{7}{{12}}$
$\frac{5}{6}$
$\frac{3}{4}$
One bag contains $5$ white and $4$ black balls. Another bag contains $7$ white and $9$ black balls. A ball is transferred from the first bag to the second and then a ball is drawn from second. The probability that the ball is white, is
A die is tossed thrice. Find the probability of getting an odd number at least once.
If $A$ and $B$ are two mutually exclusive events, then $P\,(A + B) = $
If $A$ and $B$ are any two events, then $P(A \cup B) = $
In two events $P(A \cup B) = 5/6$, $P({A^c}) = 5/6$, $P(B) = 2/3,$ then $A$ and $B$ are