Let $(1 + x)^m = C_0 + C_1x + C_2x^2 + C_3x^3 + . . . + C_mx^m$,where $C_r = {}^mC_r$ and $A = C_1C_3 + C_2C_4 + C_3C_5 + . . . + C_{m-2}C_m$. Which of the following is false?

  • A
    $A \ge {}^{2m}C_{m-2}$
  • B
    $A < {}^{2m}C_{m-2}$
  • C
    $A = {}^{2m}C_{m-2} - {}^mC_2$
  • D
    $A < C_0^2 + C_1^2 + . . . + C_m^2$

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$\binom{n}{n-r} + \binom{n}{r+1}$,whenever $0 \le r \le n-1$,is equal to

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