શ્રેણી $\frac{1}{2} + \frac{3}{4} + \frac{7}{8} + \frac{15}{16} + \dots$ ના પ્રથમ $n$ પદોનો સરવાળો શું થાય?

  • A
    $2^n - n - 1$
  • B
    $1 - 2^{-n}$
  • C
    $n + 2^{-n} - 1$
  • D
    $2^n - 1$

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કોઈપણ પૂર્ણાંક $n \geq 1$ માટે,સરવાળો $\sum_{k=1}^n k(k+2)$ કોના બરાબર છે?

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