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1299 x 1299 =?

Correct Answer: 1687401

Explanation:

1299 x 1299 = (1299)2
= (1300 - 1)2
= (1300)2 + (1)2 - 2 x 1300 x 1
= 1690000 + 1 - 2600 = 1687401


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