શ્રેણી $\frac{C_0}{2} - \frac{C_1}{3} + \frac{C_2}{4} - \frac{C_3}{5} + \dots$ ના $(n + 1)$ પદોનો સરવાળો શું થાય?

  • A
    $\frac{1}{n + 1}$
  • B
    $\frac{1}{n + 2}$
  • C
    $\frac{1}{n(n + 1)}$
  • D
    $\frac{1}{(n + 1)(n + 2)}$

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$C_0 C_r + C_1 C_{r+1} + C_2 C_{r+2} + \dots + C_{n-r} C_n =$

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$\sum_{k=0}^{20} \left({}^{20}C_{k}\right)^{2}$ ની કિંમત શું થાય?

જો $1^2 \cdot ^{20}C_1 + 2^2 \cdot ^{20}C_2 + 3^2 \cdot ^{20}C_3 + \dots + 20^2 \cdot ^{20}C_{20} = A(2^\beta)$ હોય,તો ક્રમયુક્ત જોડ $(A, \beta)$ ની કિંમત શોધો.

જો $(1-x+x^2)^n = a_0 + a_1 x + \ldots + a_{2n} x^{2n}$ હોય, તો $a_0 + a_2 + a_4 + \ldots + a_{2n}$ ની કિંમત શોધો.

$\sum\limits_{r = 0}^{n - 1} {\frac{{^n{C_r}}}{{^n{C_r} + {\,^n}{C_{r + 1}}}}} $ નું મૂલ્ય શું થાય?

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