The probability of getting heads in all the three trials,when a balanced coin is tossed thrice,is

If $A$ and $B$ are two events such that $P(A) = \frac{1}{3}$,$P(B) = \frac{1}{4}$ and $P(A \cap B) = \frac{1}{5}$,then $P\left( \frac{\overline{B}}{\overline{A}} \right) = $

$A$ bag contains $6$ red,$4$ white,and $8$ blue balls. If three balls are drawn at random,find the probability that $1$ is red and $2$ are white.

If $m$ rupee coins and $n$ ten paise coins are placed in a line,then the probability that the extreme coins are ten paise coins is

One bag contains $5$ white and $3$ black balls and a second bag contains $2$ white and $4$ black balls. One ball is drawn from the first bag and placed unseen in the second bag. What is the probability that a ball now drawn from the second bag is black?

If out of $20$ consecutive whole numbers two are chosen at random,then the probability that their sum is odd,is