One card is drawn randomly from a pack of \(52\) cards, then probability that it is a king or spade is
Answer & explanation
Correct answer: option 3
\(\begin{aligned}P(\text{ king or spade })&=P(\text{ king })+P(\text{ spade })-P(\text{ king and spade })\\ &=\frac{1}{13}+\frac{1}{4}-\frac{1}{52}\\ &=\frac{4}{13}\end{aligned}\)