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If f(x) is integrable over [1,2], then i...

If `f(x)` is integrable over `[1,2],` then `int_1^2f(x)dx` is equal to (a) `("lim")_(ntooo)1/nsum_(r=1)^nf(r/n)` (b) `("lim")_(ntooo)1/nsum_(r=n+1)^(2n)f(r/n)` (c) `("lim")_(ntooo)1/nsum_(r=1)^nf((r+n)/n)` (d) `("lim")_(ntooo)1/nsum_(r=1)^(2n)f(r/n)`

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