1.

If f:R to R is defined as f(x+y)=f(x)+f(y) AA x,y in R and f(1) = 7, find sum_(r=1)^(n)f(r ).

Answer»

`(7N)/(2)`
`(7(n+1))/(2)`
`7n(n+1)`
`(7n(n+1))/(2)`

ANSWER :D


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