With reference to Exercise 3.25, suppose that three of the spark plugs are defective. In how many

Question:

With reference to Exercise 3.25, suppose that three of the spark plugs are defective. In how many ways can 4 spark plugs be selected so that

(a) one of the defective plugs is selected;

(b) two of the defective plugs are selected;

(c) all three defective plugs are selected?

Data From Exercise 3.25

A box of 15 spark plugs contains one that is defective. In how many ways can 4 spark plugs be selected so that

(a) the defective one is selected;

(b) the defective plug is not selected?

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Ali Khawaja

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