ધારો કે $S = \frac{1}{25!} + \frac{1}{3!23!} + \frac{1}{5!21!} + \dots$ $13$ પદો સુધી છે. જો $13S = \frac{2^{k}}{n!}$ જ્યાં $k \in N$ હોય, તો $n + k$ ની કિંમત શોધો.

  • A
    $51$
  • B
    $52$
  • C
    $49$
  • D
    $50$

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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.

$2 \cdot {}^{20}C_0 + 5 \cdot {}^{20}C_1 + 8 \cdot {}^{20}C_2 + 11 \cdot {}^{20}C_3 + \dots + 62 \cdot {}^{20}C_{20}$ ની કિંમત શોધો.

જો $\sum\limits_{k=1}^{31} \binom{31}{k} \binom{31}{k-1} - \sum\limits_{k=1}^{30} \binom{30}{k} \binom{30}{k-1} = \frac{\alpha(60!)}{(30!)(31!)}$,જ્યાં $\alpha \in R$,તો $16\alpha$ ની કિંમત કેટલી થાય?

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

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જો $(1 + x)^n = C_0 + C_1x + C_2x^2 + ... + C_nx^n$ હોય,તો $C_0 + C_2 + C_4 + C_6 + ...$ ની કિંમત શું થાય?

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