જો $n = 1, 2, 3, \ldots$ માટે $t_n = \frac{1}{4}(n+2)(n+3)$ હોય, તો $\frac{1}{t_1} + \frac{1}{t_2} + \ldots + \frac{1}{t_{2003}}$ ની કિંમત શોધો.

  • A
    $\frac{4006}{3006}$
  • B
    $\frac{4003}{3007}$
  • C
    $\frac{4006}{3008}$
  • D
    $\frac{4006}{3009}$

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શ્રેણી $(1^2 + 1) \cdot 1! + (2^2 + 1) \cdot 2! + (3^2 + 1) \cdot 3! + \dots + (n^2 + 1) \cdot n!$ નો સરવાળો શું થાય?

જો $\frac{1}{2 \times 3 \times 4} + \frac{1}{3 \times 4 \times 5} + \frac{1}{4 \times 5 \times 6} + \dots + \frac{1}{100 \times 101 \times 102} = \frac{k}{101}$ હોય,તો $34k$ ની કિંમત $.....$ થાય.

જો $\frac{1}{(20-a)(40-a)}+\frac{1}{(40-a)(60-a)}+\ldots+\frac{1}{(180-a)(200-a)}=\frac{1}{256}$ હોય,તો $a$ ની મહત્તમ કિંમત શોધો.

શ્રેણીનો સરવાળો શોધો: $1 \cdot 1! + 2 \cdot 2! + 3 \cdot 3! + \dots + n \cdot n!$

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$\sum_{r=1}^{20} (r^{2}+1)(r!)$ ની કિંમત શોધો:

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