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 161?	Choose the most appropriate option
A) 2670
B) 2980
C) 3550
D) 4030
E) 4540
100 + 102 + ... + 160 =   100*31 + (2+4+...+60) =   100*31 + 2*(1+2+...+30) =   100*31 + 2(30)(31)/2 =   100*31 + 30*31 = 130(31) = 4030   The answer is 4030.
<result>D</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 161?