What will be the possibility of drawing a jack or a spade from a well shuffled standard deck of 52 playing cards?

Answer: Option A

We want jack or spade
There are 4 jacks and 13 spade cards
Total 52 cards
Also 1 jack is jack of spades
So probability
$$\begin{array}{rl}& =\frac{4}{52}+\frac{13}{52}-\frac{1}{52}\\ & =\frac{4}{13}\end{array}$$