If $P(A)$ denotes the probability of an event $A$,then

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 $/18$)

Two dice are numbered $1, 2, 3, 4, 5, 6$ and $1, 1, 2, 2, 3, 3$ respectively. They are thrown and the sum of the numbers on them is noted. Find the probability of getting each sum from $2$ to $9$ separately.

$A$ child's game has $8$ triangles of which $3$ are blue and the rest are red,and $10$ squares of which $6$ are blue and the rest are red. One piece is lost at random. Find the probability that it is a
$(i)$ triangle
$(ii)$ square
$(iii)$ square of blue colour
$(iv)$ triangle of red colour

If $P(\overline{D}) = \frac{6}{17}$,then $P(D) = \ldots$

The probability of scoring $100$ marks in a question paper of $100$ marks is ................