SOLUTION: boxes containing 30 light bulbs are to be shipped. Five bulb are selected from a box and examined. The box is not shipped if any of the bulbs is found defective. What is the probab

Question 952292: boxes containing 30 light bulbs are to be shipped. Five bulb are selected from a box and examined. The box is not shipped if any of the bulbs is found defective. What is the probability that a box will shipped if it contains
a. 8 defective bulbs?
b. 20 nondefective bulbs?
Answer by edjones(8007) (Show Source): You can put this solution on YOUR website!
These can be done one of two ways:
a)
30-8=22
22/30 * 21*29 * 20/28 * 19/27 * 18/26 = 209/1131
.
b) the second way
nCr Combination of n things taken r at a time = n!/((n-r)!*r!)
20C5/30C5
=15504/142506
=2584/23751
.
Ed

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