A box contains 90 discs which are numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears a perfect square number is:
A
119
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B
111
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C
310
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D
110
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Solution
The correct option is B110 Total number of box numbered from 1 to 90 = 90 Total number of perfect square = 9 i.e. S = (1,4,9,16,25,36,49,64,81) P(s) = 990=110