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Question: Answered & Verified by Expert
$\int_0^{1000} e^{x-[x]}$ is equal to
MathematicsDefinite IntegrationWBJEEWBJEE 2009
Options:
  • A $\frac{e^{1000}-1}{e-1}$
  • B $\frac{e^{1000}-1}{1000}$
  • C $\frac{e-1}{1000}$
  • D $1000(\mathrm{e}-1)$
Solution:
2700 Upvotes Verified Answer
The correct answer is: $1000(\mathrm{e}-1)$
Hins : $I=1000 \int_0^1 \mathrm{e}^{x-[x]}$
$=1000 \int_0^1 e^x d x=1000\left(e^x\right)_0^1=100(e-1)$
Period of function is 1

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