If P (A) = 0.18, P (B) = 0.5 and P (B|A) = 0.2, find P(A n B)?
Answers.
A) 0.28 B) 0.36 C) 0.45 D) 0.56 E) 0.7

Rationale: p ( b | a ) = p ( a n b ) / p ( a ) p ( a n b ) = p ( b | a ) × p ( a ) p ( a n b ) = 0.2 × 0.18 p ( a n b ) = 0.36 b )
Answer: B