Events A and B are Independent. Find the missing probability

P (A) = 1/4 P (B) = 3/5 P (B/A) = ?

Answer: 3/5

Explanation:

P (B/A) is the shorthand way of saying "what is P (B) if we are 100% certain that event A has occured?"

Because events A and B are independent, they do not affect one another. The fact that A happens doesn't change P (B) at all.

Therefore, P (B) = P (B/A) when A & B are independent events.

Similarly, P (A) = P (A/B) when the two events are independent.