Question

15 cards with the number 8 to 22 are put into a box.a card is drawn at random from the boxfind the probability of drawing a card with a number which is not a prime number.

Answer 1

from 8-22 the prime numbers are 11,13,17,19 hence the probability is 4/15

Answer 2

prime numbers from 8-22:
11,13,17,19
so there are 4
so u want non prime numbers so
15-4=11
so probability is
11/15

Answer 3

the probability required is 1-(4/15)=11/15

Answer 4

11/15