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  1. 1299 x 1299 = ?
    1. 1585301
    2. 1684701
    3. 1685401
    4. 1687401
Correct Option: D

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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