A box contains 90 discs which are numbered from 1 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.
(iii) a number divisible by 5.
This question is exactly same as Ex 15.1, 18 of Chapter 12 Class 10 in the NCERT Book.
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