જો $a = \sum\limits_{n = 0}^\infty {\frac{{{x^{3n}}}}{{(3n)!}}} ,\,b = \sum\limits_{n = 1}^\infty {\frac{{{x^{3n - 2}}}}{{(3n - 2)!}}} $ અને $c = \sum\limits_{n = 1}^\infty {\frac{{{x^{3n - 1}}}}{{(3n - 1)!}}} $ હોય,તો ${a^3} + {b^3} + {c^3} - 3abc$ ની કિંમત શોધો.

  • A
    $1$
  • B
    $0$
  • C
    $-1$
  • D
    $-2$

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