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Simplification - General Aptitude

Q1:

(469 + 174)2 - (469 - 174)2 = ?
(469 x 174)

A 2

B 4

C 295

D 643

ANS:B - 4

Given exp. = (a + b)2 - (a - b)2
ab
   = 4ab
ab
   = 4 (where a = 469, b = 174.)