1904 x 1904 =?
Choices:  A) 3654316  B) 3632646  C) 3625216  D) 3623436  E) None of them
=(1904)^2   =(1900+4)^2   =(1900)^2 + 4^2 + 2 x 1900 x 4   =3610000+16+15200   =3610016+15200= 
<gadget id="calculator">3610016+15200</gadget>
<output>3_625_216</output>
3625216   Answer is 3625216
<result>C</result>
1904 x 1904 =?