Probability (C10)

A box contains cards numbered 11 to 123. A card is drawn at random from the box. Find the probability that the number on the drawn card is

  1. a square number
  2. a multiple of 7

Answer

Total cards = 123 - 11 + 1 = 113

(i) P(square number) = 8/113

(ii) P(multiple of 7) = 16/113