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Question

106 x 106 - 94 x 94 = ?


Options:
A .  2400
B .  2000
C .  1904
D .  1906
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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