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From a lot of 30 bulbs which include 6 defective bulbs, a sample of 2 bulbs is drawn at random one by one with replacement. Find the probability distribution of the number of defective bulbs and hence find the mean number of defective bulbs.
Ashima can hit a target 2 out of 3 times. She tried to hit the target twice. The probability that she missed the target exactly once is
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