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If a+b+c=11 and a b+b c+c a=20 , then th...

If `a+b+c=11` and `a b+b c+c a=20` , then the value of the expression `a^3+b^3+c^3-3a b c` will be
(a) 121
(b) 341
(c) 671
(d) 781

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