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Numbers - General Aptitude

Q1:

1904 x 1904 = ?

A 3654316

B 3632646

C 3625216

D 3623436

E None of these

ANS:C - 3625216

1904 x 1904 = (1904)2
  = (1900 + 4)2
  = (1900)2 + (4)2 + (2 x 1900 x 4)
  = 3610000 + 16 + 15200.
  = 3625216.