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If `f(x+y)=f(x)+f(y)-x y-1AAx , y in Ra n df(1)=1,` then the number of solution of `f(n)=n , n in N ,` is 0 (b) 1 (c) 2 (d) more than 2

A

0

B

1

C

2

D

more than 2

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KVPY PREVIOUS YEAR-MOCK TEST 4-EXERCISE
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