Question:
A number is selected from numbers 1 to 25. The probability that it is prime is
(a) $\frac{2}{3}$
(b) $\frac{1}{6}$
(c) $\frac{1}{3}$
(d) $\frac{5}{6}$
Solution:
GIVEN: A number is selected from 1 to 25
TO FIND: Probability that, the number is a prime
Total number is 25
Numbers from 1 to 25 that are primes are 2, 3, 5, 7, 11, 13, 17, 19 and 23
Total numbers that are primes from 1 to 25 is 9
We know that PROBABILITY = 
Hence probability of getting a prime number from 1 to 25 is equal to
Hence no option is correct