A problem by Gajender Singh

Level pending

If a,b and c are in AP, Then a^3+c^3-8b^3=

2abc -6abc -4abc 4abc

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2 solutions

Sanjeet Raria
Oct 28, 2014

Clever trick- Put a = b = c = 1 a=b=c=1 and you'll know the answer.

Nice question. AP always amaze me.

Gajender Singh
Oct 27, 2014

As a,b and c are in AP

2b=a+c

a^3+c^3-8b^3=-6abc

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