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The number of teeth and the age of a person vary

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a

directly

b

inversely

c

both directly and inversely

d

neither directly nor inversely

answer is D.

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Detailed Solution

Given data is the number of teeth and the age of the person.
The number of teeth and the age of a person vary neither directly nor inversely with each other.
For upto some age teeth increases with age but not in a fixed ratio, then number of teeths remain fixed and does not increase with age.
After a certain old age number of teeth starts decreasing also, and all these vary from person to person.
Hence, the correct option is 4.

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