### Home > CCA2 > Chapter Ch12 > Lesson 12.1.2 > Problem 12-37

12-37.

Three light bulbs are chosen at random from

None of the three are defective.

Use combinations to solve this problem. For a review of combinations, see the Math Notes in Lesson 10.1.1.

. Exactly two are defective.

Use the same method as part (a).