$^{15}C_0^2 - ^{15}C_1^2 + ^{15}C_2^2 - ... - ^{15}C_{15}^2$ ની કિંમત શું છે?

  • A
    $15$
  • B
    $-15$
  • C
    $0$
  • D
    $51$

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$(x + a)^n$ ના વિસ્તરણમાં,એકી પદોનો સરવાળો $P$ છે અને બેકી પદોનો સરવાળો $Q$ છે,તો $(P^2 - Q^2)$ ની કિંમત શું થશે?

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 $(1 + x)^n = C_0 + C_1x + C_2x^2 + .......... + C_nx^n$ હોય,તો $\frac{C_1}{C_0} + \frac{2C_2}{C_1} + \frac{3C_3}{C_2} + .... + \frac{nC_n}{C_{n - 1}} = $

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જો $C_j = {}^{n}C_j$ હોય,તો $C_0 C_r + C_1 C_{r+1} + C_2 C_{r+2} + \ldots + C_{n-r} C_n = $

ધારો કે $\sum_{r=0}^{2023} r \cdot ^{2023}C_r = 2023 \times \alpha \times 2^{2022}$ છે. તો $\alpha$ ની કિંમત $............$ છે.

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