If P (A) = 0.4, than P’ (A) = ?

(A) 0.2
(B) 0.4
(C) 0.6
(D) 0.8

Answer: (C) 0.6
P’ (A) = 1 – P(A)
P’ (A) = 1 – 0.4
P’ (A) = 0.6