શ્રેણી $1 + \frac{1}{2} {}^{n}C_{1} + \frac{1}{3} {}^{n}C_{2} + \dots + \frac{1}{n+1} {}^{n}C_{n}$ નો સરવાળો કેટલો થાય?

  • A
    $\frac{2^{n+1}-1}{n+1}$
  • B
    $\frac{3(2^{n}-1)}{2n}$
  • C
    $\frac{2^{n}+1}{n+1}$
  • D
    $\frac{2^{n}+1}{2n}$

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જો $(1+x)^n = C_0 + C_1 x + C_2 x^2 + \ldots + C_n x^n$ હોય,તો $C_0 + 2 C_1 + 3 C_2 + \ldots + (n+1) C_n$ ની કિંમત શોધો.

$\mathop \sum \limits_{0 \le i < j \le n} i \binom{n}{j}$ 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 $(1 - x + x^2)^n = a_0 + a_1x + a_2x^2 + .... + a_{2n}x^{2n}$ હોય,તો $a_0 + a_2 + a_4 + .... + a_{2n} = $

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જો $C_0, C_1, C_2, \ldots, C_{10}$ એ $(1+x)^{10}$ ના વિસ્તરણમાં દ્વિપદી સહગુણકો દર્શાવતા હોય,તો $C_0 C_6+C_1 C_7+C_2 C_8+C_3 C_9+C_4 C_{10}=$

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