If in a lottary there are $5$ prizes and $20$ blanks, then the probability of getting a prize is
$\frac{1}{5}$
$\frac{2}{5}$
$\frac{4}{5}$
None of these
(a) Required probability $ = \frac{5}{{25}} = \frac{1}{5}.$
The probability of happening of an impossible event i.e. $P\,(\phi )$ is
There are $4$ envelopes with addresses and $4$ concerning letters. The probability that letter does not go into concerning proper envelope, is
The chance of throwing at least $9$ in a single throw with two dice, is
A coin is tossed $4$ times. The probability that at least one head turns up is
The probability of getting head and tail alternately in three throws of a coin (or a throw of three coins), is
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