Question

A box contains 90 discs which are numbered from 2 to 91.If one disc is drawn at random from the box .Find probability that it bears prime number less than 23

Answer 1

let PRIME NUMBERS LESS THAN 23 ARE 3 ,5,7,11,13,17,19
SO FAVOURABLE CASES =7
THERE PROBABILITY OF PRIME NUMBERS LESS THAN 23 =7÷90