Question

box contains 100 discs which are numbered from 1 to 100. If one disc 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 5. (iv) a composite number​

Answer 1

Total discs - 100

i. No. of 2 digit no. b/w 1 to 100 = 90

So , probability = 90/100

ii. Perfect squares b/w 1 to 100 = 10

So , probability = 10/10

iii. No.'s b/w 1 to 100 divisible by 5 = 19

So , probability = 19/100

iv. Composite number b/w 1 to 100 = 74

So , probability = 74/100

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