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 181? Select the correct option
A) 3820	B) 5740	C) 6580	D) 7360	E) 9200
100 + 102 + ... + 180 =   100*41 + (2+4+...+80) =   100*41 + 2*(1+2+...+40) =   100*41 + 2(40)(41)/2 =   100*41 + 40*41 = 140(41) = 5740   The answer is 5740.
<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 181?