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Question

The value of 10([2x]3)([3x]7)dx is,
where [.] denotes the greatest integer function.

A
10
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B
463
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C
413
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D
373
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Solution

The correct option is B 463
10([2x]3)([3x]7)dx=130(3)(7)dx+1213(3)(17)dx+2312(13)(17)dx+123(13)(27)dx=21×13+18×16+12×16+10×13=463

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