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Question

Given, f(x)= sum of all natural numbers which can divide x completely, then find : f(12).

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Solution

Given, f(x)= sum of all natural numbers which can divide x completely.

Thus f(12)= Sum of all natrual numbers which can divide 12 completely,

Divisors of 12 are 1,2,3,4,6,12.

Therefore, f(12)=1+2+3+4+6+12=28

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