Arithmetic Ability
 Probability

75 / 132

Q.

A box contains 5 detective and 15 non-detective bulbs. Two bulbs are chosen at random. Find the probability that both the bulbs are non-defective.

View Answer

Correct choice: C

Explanation:

n(S) = 20C2 = 190 n(E) = 15C2 = 105 Therefore, P(E) = 105/190 = 21/38
75 / 132