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Question

1397 x 1397 = ?


Options:
A .  1951609
B .  1981709
C .  18362619
D .  2031719
E .  None of these
Answer: Option A

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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