જો (a + b + c) = 0 હોય તો 3 + b 3 + c 3 ની કિંમત કેટલી છે?

1
a 2 + b 2 + c 2 - 3 abc
2
0
3
3 abc
4
a 2 + b 2 + c 2 - ab - bc - ca

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