A person can kill a bird with probability $3/4$. He tries $5$ times. What is the probability that he may not kill the bird
$\frac{{243}}{{1024}}$
$\frac{{781}}{{1024}}$
$\frac{1}{{1024}}$
$\frac{{1023}}{{1024}}$
Three coins are tossed. Describe Two events which are mutually exclusive.
In a throw of a die, what is the probability of getting a number less than $7$
Three coins are tossed once. Find the probability of getting no tails.
Three letters are dictated to three persons and an envelope is addressed to each of them, the letters are inserted into the envelopes at random so that each envelope contains exactly one letter. Find the probability that at least one letter is in its proper envelope.
A determinant is chosen at random. The set of all determinants of order $2$ with elements $0$ or $1$ only. The probability that value of the determinant chosen is positive, is