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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:
`(i) (9)/(10) (ii) (1)/(10) (iii) (1)/(5)`
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