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
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-> 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
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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):
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)
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