4.16: Probability in Random Experiments | Exercise Solution of Probability & Statistics by Walpole

This is the exercise problems solution of the 9th edition of"Probability and Statistics for Engineers and Scientists by Walpole". In this video, I solve exercise problem 4.16 to find the number of defective items.
4.16 Suppose that you are inspecting a lot of 1000 light bulbs, among which 20 are defectives. You choose two light bulbs randomly from the lot without replacement. Let
X1 =
1, if the 1st light bulb is defective,
0, otherwise,
X2 =
1, if the 2nd light bulb is defective,
0, otherwise.
Find the probability that at least one light bulb chosen is defective. [Hint: Compute P(X1 + X2 = 1).]
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when you will upload next exercise