1.  1904 x 1904 = ?
A. 3623436
B. 3625216
C. 3632646
D. 3654316
E. None of these

Answer: Option B

Explanation:

1904 x 1904= (1904)2
= (1900 + 4)2
= (1900)2 + (4)2 + (2 x 1900 x 4)
= 3610000 + 16 + 15200.
= 3625216.