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

  • A
    ${}^{40}C_{21}$
  • B
    ${}^{40}C_{19}$
  • C
    ${}^{40}C_{20}$
  • D
    ${}^{41}C_{20}$

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Similar Questions

$\mathop \sum \limits_{0 \le i < j \le n} i \binom{n}{j}$ ની કિંમત શોધો.

$\frac{1}{1!(n - 1)!} + \frac{1}{3!(n - 3)!} + \frac{1}{5!(n - 5)!} + \dots = $

$^{4n}C_0 + ^{4n}C_4 + ^{4n}C_8 + ... + ^{4n}C_{4n}$ નું મૂલ્ય શું છે?

Difficult
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$2 \le r \le n$ માટે,$\binom{n}{r} + 2\binom{n}{r-1} + \binom{n}{r-2}$ ની કિંમત શોધો.

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.

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