Please solve asap and if its a probability question please answer with e^ the number no matter how small it is

1. Let A and B be two events such that PIA] - P[B) - 1/3 and P[An B] = 1/4. It follows that: PA | AUB - 1/2 PA | AUB] - 1 C P[A | AU B] - 4/5 P[A | AUB] = 0