By accident, six burned-out bulbs have been mixed in with 16 good ones. Ken is replacing old bulbs in his house. If he selects t wo bulbs at random from the box of 22, what is the probability they both work?
1 answer:
We will assume that he does not replace the first one.
He needs to choose 2 good one from 16 good ones. How can he do this?
The total number of ways of choosing 2 lightbulbs [good or bad] is
So the probability of getting a good light bulb is
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