If $P(A) : P(\bar{A}) = 3 : 4$,then $P(A) =$ .........

Two balanced dice are rolled. Find the probability that the sum of numbers on two dice is greater than $8$. (in $/18$)

There are $5$ white,$7$ red,$4$ black and $2$ blue identical balls in a box. One ball is selected at random from the box. Find the probability that the selected ball is either red or black. (in $/18$)

There are $5$ white,$7$ red,$4$ black,and $2$ blue identical balls in a box. One ball is selected at random from the box. Find the probability that the selected ball is either white or blue.

There are chits numbered $1$ to $20$ in a box. One chit is drawn at random. Find the probability that the number on the chit is a multiple of $5$. (in $/5$)

The probability of the month of February of a non-leap year having $5$ Wednesdays is ...... .