Suppose you have 100 light bulbs and one of them is defective. If you pick out two light bulbs at random (either borh at the same time, or first one, then another, without replacing the first light bulb), what is the probability that one of your chosen light bulbs is defective?
i got an answer, but it seemed too easy
1/100 + (1/100)(1/99)
is this right?