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In a lot of 12 Microwave ovens, there ar...

In a lot of 12 Microwave ovens, there are 3 defective units. A person has ordered 4 of these units and since each is identically packed, the selection will be random. What is the probability that i. all 4 units are good. ii. Exactly 3 units are good, iii. at least 2 units are good.

Text Solution

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The correct Answer is:
(i) `(14)/(55)` (ii) `(28)/(55)`.
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