Question

$15$ cards numbered $1,2,3,4,...,14,15$ are put in a box and mixed thoroughly. A man draws a card at random form the box. Find the probability that the number on the card is a prime number.

Answer 1

We have,

Total number of cards$=15$

Prime cards$=2,3,5,7,11,13$

Numer of prime cards$=6$

Probability of Prime card$=\frac{6}{15}=\frac{2}{5}$

Hence, this is the answer.