SOLUTION: 7. A flashlight has 6 batteries, 2 of which are defective. If 2 are selected at random without replacement, find the probability that both are defective.

Question 268772: 7. A flashlight has 6 batteries, 2 of which are defective. If 2 are selected at random without replacement, find the probability that both are defective.
Found 2 solutions by palanisamy, stanbon:
Answer by palanisamy(496) (Show Source): You can put this solution on YOUR website!
Out of 6 batteries 2 can be selected in 6C2 = (6*5)/1*2 = 15 ways.
Two batteries are defective.
Out of 2 defective batteries 2 can be selected in 2C2 = 1 way.
Probability of selecting both batteries defective = 1/15
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A flashlight has 6 batteries, 2 of which are defective. If 2 are selected at random without replacement, find the probability that both are defective.
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# of pairs of defectives: 2C2 = 1
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# of random pairs: 6C2 = 15
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P(select 2 defective) = 1/15
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Cheers,
Stan H.
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