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Numbers - General Aptitude

Q1:

1397 x 1397 = ?

A 1951609

B 1981709

C 18362619

D 2031719

E None of these

ANS:A - 1951609

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