Question

A number is selected from numbers 1 to 27. The probability that it is prime is

• A. $\frac{2}{3}$
• B. $\frac{1}{8}$
• C. $\frac{1}{6}$
• D. $\frac{2}{9}$

Answer 1

The correct option is C $\frac{1}{6}$

Total number of possible cases = 27
Favourable cases = {2, 3, 5, 7, 11, 13, 17, 19, 23}
Total number of favourable cases = 9
P (prime) = $\frac{9}{27}=\frac{1}{3}$