a box contains 90 discs which are numbered from 1 to 90. disc is drawn at random from the box,find the probability that it bears (i)a two-digit numbert(ii)a perfect square number (iii)a number divisible by 5.
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1.
Total two digit number= 81
Probability of getting two digit number=81/90
=9/10
2.
Prefect square numbers from 1 to 90=
1,4,9,16,.....81
Total no= 9
Probability of getting square number=9/90=1/10
3.
Total no. Divisible by 5=18
Probability= 18/90=1/5
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