If A and B are mutually exclusive events and if P ( B )=(1/3), P ( A ∪ B )=(13/21), then P ( A ) is equal to

Question

If A and B are mutually exclusive events and if P ( B )=(1/3), P ( A ∪ B )=(13/21), then P ( A ) is equal to (A) 1 / 7 (B) 4 / 7 (C) 2 / 7 (D) 5 / 7

Tardigrade Admin · Accepted Answer

For mutually exclusive events P ( A ∪ B )= P ( A )+ P ( B ) ⇒ P ( A )=(2/7)

Q. If $A$ and $B$ are mutually exclusive events and if $P (B) = \frac{1}{3}$ , $P (A \cup B) = \frac{13}{21}$ , then $P (A)$ is equal to