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  1. 1397 x 1397 = ?

    2. A.

    1951609
    B.

    1981709
    C.

    18362619
    D.

    2031719
    E.

    None of these

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    Answer : Option A

    Explanation :

    1397 x 1397    = (1397)2
    = (1400 - 3)2
    = (1400)2 + (3)2 - (2 x 1400 x 3)
    = 1960000 + 9 - 8400
    = 1960009 - 8400
    = 1951609.

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