Question

A box contains 90 dises which are numbered from I to 90. If one disc is drawn at random from the box, find the probability that it bears (i) a two digit number (ii) a perfect square number (ii) a number divisible by 5.
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Answer 1

A)There are 81 two digit numbers between 1 and 90 so probability is 81/90.

B)There are 9 perfect squares between 1 and 90 so probability is 9/90.

c)There are 18 numbers which are divisible by 5 between 1 and 90 so probability is 18/90.