Question

11. 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 cards is
a) a square number
b) a multiple of 7

12. A box contains 12 balls of which some are red in colour. If 6 more red balls are put in the box and a ball is drawn at random, the probability of drawing a red ball doubles than what it was before. Find the number of red balls in the bag.

Answer 1

a square number of probability between 11-123 is 0.71 and multiple of 7 probability is 0.14