If the sum of the first n positive integers is S, what is the sum of the first n negative even integers, in terms of S ?
Options: A) S/2 B) S C) 2S D) 2S + 2 E) 4S
Answer is 2S   Given sum of -1 -2 -3.....-n = S   sum of -2 , -4 , -6 ....-2n = 2[sum(-1 -2 -3....n) ] = 2S
<result>C</result>
If the sum of the first n positive integers is S, what is the sum of the first n negative even integers, in terms of S ?