SOLUTION: 2 bulbs are selected from a lot of 12 bulbs which contains 5 defected bulbs. Find the probability of getting 2 defected bulbs. Also find the probability of getting at least 1 defec

Question 657829: 2 bulbs are selected from a lot of 12 bulbs which contains 5 defected bulbs. Find the probability of getting 2 defected bulbs. Also find the probability of getting at least 1 defected bulb.
Answer by kevwill(135) (Show Source): You can put this solution on YOUR website!
There are ways to choose 2 defective bulbs from the five defective bulbs in the box.
There are ways to choose 2 bulbs from the 12 in the box.
Thus, the probability of picking 2 defective bulbs is
There are ways to choose 2 non-defective bulbs from the seven non-defective bulbs in the box.
Thus, the probability of picking 2 non-defective bulbs is
Finally, the probability of picking at least one defective bulb is

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