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F(x + y) = f(x) + f(y), for all x,y ∈ R and f(1) = 7, then Σf(r) for r = 1 To n (in Hindi)

Lesson 4 of 15 • 54 upvotes • 8:13mins

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Nisha Mittal

f : R →R satisfies f(x + y) = f(x) + f(y), for all x,y ∈ R and f(1) = 7, then Σf(r) for r = 1 to n, is (a) 7n/2 (b) 7(n + 1)/2 (c) 7n(n + 1) (d) 7n(n + 1)/2

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