A shipment of 10 computers contains 3 with defects. Find the probability that a sample of size 3, drawn from the 10, will not contain a defective computer.

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Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.