A B are two independent events such that P( barA)=0.7, P( barB)=a P(A ∪ B)=0.8, then, a=

Question

A B are two independent events such that P( barA)=0.7, P( barB)=a P(A ∪ B)=0.8, then, a= (A) 5 / 7 (B) 2 / 7 (C) 1 (D) none

Tardigrade Admin · Accepted Answer

0.8=0.3+(1-a)-0.3(1-a) ⇒ a=2 / 7

Q. A \& $B$ are two independent events such that $P (\overset{ˉ}{A}) = 0.7, P (\overset{ˉ}{B}) = a & P (A \cup B) = 0.8$ , then, $a =$