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

If `f(x)` is integrable over `[1,2]` then `int_(1)^(2)f(x)dx` is equal to

A

`lim _(n to oo) 1/n sum _(r =1) ^(n ) f ((r )/(n))`

B

`lim _(n to oo) 1/n sum _(r =n +1) ^(2n)f ((r )/(n ))`

C

`lim _( n to oo) 1/n sum _(r =1)^(n) f ((r+n)/(n))`

D

`lim _( n to oo) 1/n sum _(r=1) ^(2n) f ((r )/(n))`

Text Solution

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The correct Answer is:
B, C
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