For all rest numbers x and y, it is know...

For all rest numbers x and y, it is known as the real valued function f satisfies f (x) + f (y) = f (x + y). If f(1) = 7, then `Sigma_(r=1 )^(100)` f(r ) is equal to

A

`7xx651xx102`

B

`6xx50xx102`

C

`7xx50xx101`

D

`6xx25xx102`

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The correct Answer is:

D

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