A box contains 90 discs which are numbered from 1 to 90. If one discs is drawn at random from the box, find the probability that it bears (i) a two digit number (ii) a perfect square number (iii) a number divisible by 5.
Total number of possible outcomes, n(S) = 90
(i) Number of favorable outcomes, n(E) = 81
(ii) Number of favorable outcomes, n(E) = 9
(iii) Number of favorable outcomes, n(E) = 18
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