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7. Three light bulbs are selected at random from 20 bulbs of which 5 are defective. What is the
probability that (i) none of the bulbs is defective and (ii) exactly one is defective.
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7. Three light bulbs are selected at random from 20 bulbs of which 5 are defective. What is the
probability that (i) none of the bulbs is defective and (ii) exactly one is defective.
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