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Question

(489 + 375)2 - (489 - 375)2 = ? (489 x 375)


Options:
A .  144
B .  864
C .  2
D .  4
E .  None of these
Answer: Option D

Given Exp. = (a + b)2 - (a - b)2 = 4ab = 4 ab ab



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