1.  {(476 + 424)2 - 4 x 476 x 424} = ?
A. 2906
B. 3116
C. 2704
D. 2904
E. None of these

Answer: Option C

Explanation:

Given Exp.

= [(a + b)2 - 4ab], where a = 476 and b = 424
= [(476 + 424)2 - 4 x 476 x 424]
= [(900)2 - 807296]
= 810000 - 807296
= 2704.