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42 x 42 = 1764
The solution follows A=42 42X42=1764 B=56 56X56=3136 sum of above=4900 (70X70=4900) Given you was looking for C and not C squared. Try A and B and doublecheck it for me.
42 42X42=1764
If you answer 42x42,the answer is1 764 arrays.