What is the value of 16^2 + 17^2 + 18^2 + 19^2 + 20^2 + 21^2 + 22^2 + 23^2 + 24^2 ?  Pick one.
A) 3298 B) 3660 C) 3670 D) 3328 E) 3338
This is what I did, all the nos are close to 20, and squared, so 20^2 plus there are 9 numbers, so (20)^2 x 9 =3600,   now squaring the last digits of each no individually comes up to   (16+9+4+1+0+1+4+9+16)= 
<gadget id="calculator">  (16+9+4+1+0+1+4+9+16)</gadget>
<output>60</output>
60.   when you add the 2 up it gives you a  (3600+60)= 
<gadget id="calculator"> (3600+60)</gadget>
<output>3_660</output>
3660,   Answer is 3660
<result>B</result>
What is the value of 16^2 + 17^2 + 18^2 + 19^2 + 20^2 + 21^2 + 22^2 + 23^2 + 24^2 ?