To find: The number n such that .
The number n is 12.
Let c be a constant and n be a positive integer. Then,
, and .
By the above theorem, it is given that .
Thus, the expression simplified as, .
Solve the equation and obtain the value of n.
The equation is a quadratic equation with variable n.
Here, the value of .
Solve the quadratic equation .
That is, the number n is .
The sum is positive thus, the number is not possible.
Therefore, the sum as when .
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