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 $5$ red,$8$ white,and $4$ green balls in a box. If one ball is drawn at random from the box,find the probability that the ball drawn is white.

If $P(A) : P(\bar{A}) = 3 : 2$,then $P(A) = \dots$

Two dice are thrown at the same time. Determine the probability that the difference of the numbers on the two dice is $2$.

$A$ carton contains $100$ trousers of which $73$ are good,$12$ have minor defects and $15$ have major defects. Manu rejects only those trousers which have major defects. One trouser is selected at random from the carton. Then,the probability that the selected trouser is accepted by Manu is $\ldots \ldots \ldots \ldots .$

If $P(C) = \frac{2}{5}$,then $P(\bar{C}) = \ldots \ldots \ldots$