(164)^2 - (163)^2 = Select the correct option
A) 1  B) 100  C) 229  D) 327  E) 349
Using the formula:   (a+1)^2 - a^2 = 2a+1   So, Answer = 163*2 + 1   = 326+1= 
<gadget id="calculator">326+1</gadget>
<output>327</output>
327= Answer = 327
<result>D</result>
(164)^2 - (163)^2 =