SOLUTION: A lot contains 20 electric bulbs 5 of which are defective. In how many ways can 4 bulbs be taken for inspection such that: a. no defective electric bulb is included? b. 2 of the

Question 1178924: A lot contains 20 electric bulbs 5 of which are defective. In how many ways can 4 bulbs be taken for inspection such that:
a. no defective electric bulb is included?
b. 2 of the defective bulbs are included?
c. all of the defective bulbs are included?
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!


Hi
20 bulbs: 15(good)  5(def)
4 BULBS TAKEN:
ways..
a. no defective electric bulb is included? (15C4)(5C0)
b. 2 of the defective bulbs are included? (15C2)(5C2)
c. all of the defective bulbs are included? (5C4)(15C0)

Wish You the Best in your Studies.

RELATED QUESTIONS
A container has 12 light bulbs, 4 of which are defective. Select 4 light bulbs. How many (answered by jim_thompson5910)

A quality control inspector has drawn a sample of 11 light bulbs from a recent... (answered by Boreal)

. A factory produces very small electric light bulbs. It is known from experience that 6% (answered by stanbon)

Of 10 electric bulbs,three are defective but it not known which are defective. in how... (answered by stanbon)

A a quality control inspector examined 100 light bulbs and found 7 defective.at this rate (answered by Theo)

A large lot of light bulbs contains 15% defective. If 9 light bulbs are randomly selected (answered by edjones)

A shipment of 10 TV sets contains 2 units that are defective. In how many ways can 3 TV... (answered by greenestamps)

If two percent of electric bulbs manufactured are defective,find the probability that in... (answered by stanbon)