Question

cards marked 3 to 101 are placed in a box and mixed thoroughly. one card is drawn from the box. find probablity excaly divisible by 2 and 5

Answer 1

there would be 50 no.s divisible by 2 and 20 by 10 but in there will be 10 no.s common to 2 and 5 divisibility and so there will be 60 no.s