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In a box containing 15 bulbs, 5 are defe...

In a box containing 15 bulbs, 5 are defective. If 5 bulbs are selected at random from the box, the probability of the event that
(i) none of them is defective is `12/143`
(ii) only one of them is defective is `50/143`
(iii) atleast one of them is defective is `131/143`

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