18 replies

Functional equations, number of solutions

f(x+y) = f(x) + f(y) - xy - 1

f(x+y) = f(x) + f(y) - xy - 1

, x and y are real numbers, and

f(1) = 1

f(1) = 1

, then the number of solutions of

f(n) = n

f(n) = n

, where n is a natural number is?

A. one
B. no solution
C. three
D. None of these

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Functional equations, number of solutions

Functional equations, number of solutions

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