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

Hey

Here is your answer,

Total bulbs = 20
Defective = 4
Non - defective = 20-4 =16

Probability that at least one of these is defective = 4/20
= 1/5

Hope it helps you!

Answer 2

Hey

Here is your answer,

Total bulbs = 20

Defective = 4

Non - defective = 20-4 =16

Probability that at least one of these is defective = 4/20

= 1/5

Hope it helps you!