GMATinsight wrote:
What is the sum of first 10 non-negative even integers?
A) 40
B) 90
C) 100
D) 110
E) 200
The first 10 non-negative even integers are from 0 to 18.
The average of those integers is (0 + 18)/2 = 18/2 = 9.
Thus, the sum of those integers is 9 x 10 = 90.
Answer: B
