$a > 1, \; \int_{1}^{a} [x] f'(x) dx = $

  • A
    $a f(a) - \{f(1) + f(2) + \dots + f([a])\}$
  • B
    $[a] f(a) - \{f(1) + f(2) + \dots + f([a])\}$
  • C
    $[a] f([a]) - \{f(1) + f(2) + \dots + f(a)\}$
  • D
    $a f([a]) - \{f(1) + f(2) + \dots + f(a)\}$

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