Question

A box contains 20 electric bulbs, out of which 4 are defective. Two bulbs are chosen at random from this box. The probability that at least one of these is defective is

Answer 1

Answer:

Probability of atleast 1 bulb is defective=1-P(none of the bulbs that are defective)

=1-16/20

=7/19

Answer 2

Answer:

1/5

Step-by-step explanation:

Because there are 4 defective bulbs =4/20

=1/5