If f(x+y)=f(x)+f(y)-xy-1 AA x, y in R an...

If `f(x+y)=f(x)+f(y)-xy-1 AA x, y in R` and `f(1)=1` then the number of solution of `f(n)=n, n in N` is

A

0

B

1

C

2

D

more than 2

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The correct Answer is:

B

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