Question

Cards marked with numbers 2, 3, 4, 5, ......, 11 are placed in a box. One card is drawn at random from the box. Find the probability that number is a prime number.

Answer 1

No. of prime numbers in the series is 5

total numbers in the series is 10

probability of a prime number is 5/10=1/2

Answer 2

This is the answer to your question