Question

A box contains cards marked woth numbers 5 to 20 . a card is drawn from the bag at random. find the probability of getting a number which is a perfect square

Answer 1

perfect square between 5 to 20 are 9and16

total outcomes = 15

no.of favourable outcomes =2

probability = 2/15

Answer 2

total number of cards n (s) = 15

Let A be the card have a perfect square
A = 9
n (A) = 1

probability of A = n (A) / n (S)
= 1 / 15