# Working with conditional probability.

Not what you're looking for? Search our solutions OR ask your own Custom question.

There are 12 light bulbs, 5 of which are defective. All bulbs look alike and have an equal probability of being chosen. Three light bulbs are selected and placed on the table.

Find the probability that:

a) All three are defective.

b) Two are defective.

c) That none are defective.

Â© BrainMass Inc. brainmass.com March 6, 2023, 1:09 pm ad1c9bdddfhttps://brainmass.com/math/probability/conditional-probability-example-problem-4493

#### Solution Preview

Assuming no replacement

Let defective bulbs be D

non defective bulbs be ND

a) P(all 3 defective) = D x D x D

= ...

#### Solution Summary

The probability of picking defective light bulbs is calculated.

$2.49