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

  • A
    $\binom{55}{4}$
  • B
    $\binom{55}{3}$
  • C
    $\binom{56}{3}$
  • D
    $\binom{56}{4}$

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Similar Questions

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

જો $(1+x)^n$ ના વિસ્તરણમાં $x^4, x^5$ અને $x^6$ ના સહગુણકો સમાંતર શ્રેણીમાં હોય,તો $n$ ની મહત્તમ કિંમત કેટલી થાય?

$-{ }^{15}C_{1} + 2 \cdot { }^{15}C_{2} - 3 \cdot { }^{15}C_{3} + \ldots - 15 \cdot { }^{15}C_{15} + { }^{14}C_{1} + { }^{14}C_{3} + { }^{14}C_{5} + \ldots + { }^{14}C_{11}$ ની કિંમત શોધો.

જો $(1 - x + x^2)^n = a_0 + a_1x + a_2x^2 + .... + a_{2n}x^{2n}$ હોય,તો $a_0 + a_2 + a_4 + .... + a_{2n} = $

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$\frac{C_0}{1} + \frac{C_1}{2} + \frac{C_2}{3} + .... + \frac{C_n}{n + 1} = $

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