試題詳解

134. George and Paul play a betting game. Each chooses an integer from 1 to 20 (inclusive) at random. If the two numbers differ by more than 3, George wins the bet. Otherwise, Paul wins the bet.
Calculate the probability that Paul wins the bet.
(A) 0.27
(B) 0.32
(C) 0.40
(D) 0.48
(E) 0.66