The probability of choosing at random a number that is divisible by $6$ or $8$ from among $1$ to $90$ is equal to
$\frac{1}{6}$
$\frac{1}{{30}}$
$\frac{{11}}{{80}}$
$\frac{{23}}{{90}}$
In order to get at least once a head with probability $ \ge 0.9,$ the number of times a coin needs to be tossed is
Three coins are tossed once. Find the probability of getting atleast $2$ heads.
If $E$ and $F$ are events with $P\,(E) \le P\,(F)$ and $P\,(E \cap F) > 0,$ then
A card is selected from a pack of $52$ cards. Calculate the probability that the card is an ace of spades.
A number is chosen from first $100$ natural numbers. The probability that the number is even or divisible by $5$, is