Question

A child has toy blocks that contain the numbers 1 through 80. What is the probability that the will pick up a number that is

not a multiple of 11?
• Give your answer in fraction form. Reduce the fraction if necessary.

Answer 1

73/80

Explanation:

multiples of 11 between 1 and 80 are 11,22,33,44,55,66,77

number of terms=7

P(multiple of 11)=7/80

P(not a multiple of 11)=1-7/80=73/80