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



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