Question

A box contains 90 discs, numbered from 1 to 90. If one disc is drawn at random from the box, the probability that it bears a prime number less than 23,is :

Answer 1

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Answer 2

favourable outcomes ; 2, 5, 7, 9, 11, 13 , 17 , 19

So ,

P = 8/90 = 4/45.