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| 1. |
107 x 107 + 93 x 93 = ? |
| Answer» 107 x 107 + 93 x 93 = (107)2 + (93)2 = (100 + 7)2 + (100 - 7)2 = 2 x [(100)2 + 72] [Ref: (a + b)2 + (a - b)2 = 2(a2 + b2)] = 20098 | |