Question: 8. The probability is p that a randomly chosen light bulb is defective. We screw a bulb into a lamp and switch on the current.

8. The probability is p that a randomly chosen light bulb is defective. We screw a bulb into a lamp and switch on the current. If the bulb works, we stop; otherwise, we try another and continue until a good bulb is found. What is the probability that at least n bulbs are required?

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