$\sum \limits_{k=0}^{6} {}^{51-k}C_{3}$ ની કિંમત શોધો.

  • A
    ${}^{51}C_{4}-{}^{45}C_{4}$
  • B
    ${}^{51}C_{3}-{}^{45}C_{3}$
  • C
    ${}^{52}C_{4}-{}^{45}C_{4}$
  • D
    ${}^{52}C_{3}-{}^{45}C_{3}$

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જો $\sum_{k=1}^{10} k^{2} \binom{10}{k}^{2} = 22000 L$ હોય,તો $L$ ની કિંમત $.....$ છે.

ધારો કે $(1+2x)^{20} = a_0 + a_1x + a_2x^2 + \dots + a_{20}x^{20}$. તો $3a_0 + 2a_1 + 3a_2 + 2a_3 + 3a_4 + 2a_5 + \dots + 2a_{19} + 3a_{20}$ ની કિંમત શોધો.

$^nC_0, ^nC_1, ^nC_2, \dots, ^nC_n$ નો સમાંતર મધ્યક શોધો.

જો $n$ એક ધન પૂર્ણાંક હોય,તો $\sum_{r=1}^n r^2 \cdot C_r = (\ldots \ldots \ldots) 2^{n-2}$

$\binom{50}{4} + \sum_{i=1}^{6} \binom{56-i}{3} = \dots$

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