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

If 4 bulbs are there each of which can be defective or non-defective then what is the probability that at least one bulb is non- defective? Correct Answer 15/16

Each bulb can have two cases i.e. either defective or non-defective. Then total number of outcomes will be 24 = 16. Probability that all the bulbs are defective is 1/16. So, the probability that at least one bulb is non-defective is 1-1/16 = 15/16.
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