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Numbers - General Aptitude

Q1:

106 x 106 - 94 x 94 = ?

A 2400

B 2000

C 1904

D 1906

E None of these

ANS:A - 2400

106 x 106 - 94 x 94 = (106)2 - (94)2
  = (106 + 94)(106 - 94)    [Ref: (a2 - b2) = (a + b)(a - b)]
  = (200 x 12)
  = 2400.