$(5 x+3)(5 x-3) = \dots$

  • A
    $25 x^{2}+9$
  • B
    $25 x^{2}-9$
  • C
    $25 x^{2}-30 x-9$
  • D
    $25 x^{2}+30 x+9$

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सिद्ध कीजिए कि $(a+b+c)^{3}-a^{3}-b^{3}-c^{3}=3(a+b)(b+c)(c+a).$

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