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A box contains 90 discs which are num...

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.

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The correct Answer is:
Total no. = 90
(i) Two digit no.s 10, 11, 12, ……., 90
No. of favourable cases = 90 – 10 + 1 = 81
Required probability `=(81)/(90)=(9)/(10)`
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