For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.
What is the sum of all the even integers between 99 and 171? Choose the correct option
A) 4420
B) 4860
C) 5250
D) 5780
E) 6340
100 + 102 +...+ 170 = 36*100 + (2+4...+70) = 36*100 + 2(1+2+...+35) =   36*100 + 2(35)(36)/2 = 135*36= 
<gadget id="calculator">135*36</gadget>
<output>4_860</output>
4860   The answer is 4860.
<result>B</result>
For any positive integer n, the sum of the first n positive integers equals [n(n+1)]/2.
What is the sum of all the even integers between 99 and 171?