Without actually calculating the cubes,find the value of each of the following:
$(21)^{3} + (15)^{3} + (-36)^{3}$

  • A
    $61280$
  • B
    $-34020$
  • C
    $65041$
  • D
    $-53120$

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$(iii)$ the coefficient of $x^{6}$
$(iv)$ the constant term

Factorise:
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Without actually calculating the cubes,find the value of:
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