Question

Q. 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 a). a number divisible by 2 or 3.​

Answer 1

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The perfect square numbers between 1 to 90 are 1,4,9,16,25,36,49,64,81 which are 9 in number. So the possible outcome of choosing one disc at random from the box, is 90C1

Answer 2

Answer:

The perfect square numbers between 1 to 90 are 1,4,9,16,25,36,49,64,81 which are 9 in number. So the possible outcome of choosing one disc at random from the box, is 90C1 . Thus the possible outcome of choosing one disc and it bears a perfect square number, is 9C1.