If $P(A) = \frac{1}{2}$,$P(B) = \frac{1}{3}$ and $P(A \cap B) = \frac{1}{4}$,then $P(B/A) = $

There are $4$ envelopes with addresses and $4$ corresponding letters. The probability that no letter goes into its correct envelope is:

An integer is chosen at random and squared. The probability that the last digit of the square is $1$ or $5$ is

In a single throw of $2$ dice,find the probability of getting a total of $8.$

Two dice are thrown together. The probability that the sum of the two numbers will be a multiple of $4$ is

$A$ bag contains $5$ white,$7$ red,and $8$ black balls. If four balls are drawn one by one without replacement,what is the probability that all are white?