Answer:
B is the answer as it's means intersection and none of the numbers intersect x and y
0.9 x 30 = 27
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You should have put a picture of the question so ppl could see what your talkin bout
If nCk represents the number of ways k parts can be chosen from a pool of n, the probability of interest is the complement of the probability of selecting all good parts.
1 - (167C3)/(170C3) = 42,085/804,440 ≈ 0.0523
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nCk = n!/(k!(n-k)!)