1. From a lot of 10 construction materials, 4 are selected at random and tested. If the lot contains 3 defective materials that will not survive the test, what is the probability that, without...

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Extracted text: 1. From a lot of 10 construction materials, 4 are selected at random and tested. If the lot contains 3 defective materials that will not survive the test, what is the probability that, without replacement: (a) all 4 will survive the test (b) at most 2 will not survive the test?