A shipment of 250 netbooks contains 3 defective units

A shipment of 250 netbooks contains 3 defective units. Determine how many ways a vending company can buy three of these units and receive:

a) No defective units

b) all defective units

c) at least one good unit

Also need the probability of the above.

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A shipment of 250 netbooks contains 3 defective units : a shipment of 250 netbooks contains 3 defective units. determine how many ways a vending company can buy three of these

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