Why (a+b +c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca | MASTERMIND LOGICAL QUESTION #13

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Why (a+b +c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca | MASTERMIND LOGICAL QUESTION #13

Why (a+b +c)2 = a2 + b2 + c2 + 2ab + 2bc + 2ca | MASTERMIND LOGICAL QUESTION #13