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If 4 bulbs are there each of which can be defective or non-defective then what is the probability that all the bulbs are defective?

If 4 bulbs are there each of which can be defective or non-defective then what is the probability that all the bulbs are defective? Correct Answer 1/16

Each bulb can have two cases i.e. either defective or non-defective. Then total number of outcomes will be 24 = 16. So, the probability that all the bulbs are defective is 1/16.

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