$\int\limits_0^\infty [2e^{-x}]\, dx$,જ્યાં $[x]$ એ મહત્તમ પૂર્ણાંક વિધેય દર્શાવે છે,તેની કિંમત શું થાય?

  • A
    $0$
  • B
    $\ln 2$
  • C
    $e^2$
  • D
    $2/e$

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