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Question

106 x 106 - 94 x 94 = ?


Options:
A .  2400
B .  2000
C .  1904
D .  1906
E .  none of these
Answer: Option A

106 x 106 - 94 x 94  =` (106^2)` - `(94^2)`   =( 106 + 94 )  (106 - 94 )      [(`a^2` -`b^2`) =( a +b ) ( a - b )]

                                (200  x 12 ) = 2400



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