15 . I f   o n e   A   M   ' a '   a n d   t w o   G   M ' s   p   a n d   q   a r e   i n s e r t e d   b e t w e e n   a n y   t w o   g i v e n s h o w   t h a t   p 3 + q 3 = 2 a p q .

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Solution is here
For formulaes refer RD sharma

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plss do send the ans with formula
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