The number of teeth and the age of a person vary
Question:

The number of teeth and the age of a person vary

(a) directly with each other

(b) inversely with each other

(c) neither directly nor inversely with each other

(d) sometimes directly,and sometimes inversely with each other

Solution:

(d) The number of teeth and the age of a person vary sometimes directly and sometimes inversely with each other, we cannot predict about the

number of teeth with exactly the age of a person. It change with person-to-person.

Hence, option (d) is correct.

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