BTGmoderatorDC wrote:If the sum of the first 30 positive odd integers is k, what is the sum of first 30 non-negative even integers?
A. k-29
B. k-30
C. k
D. k+29
E. k+30
OA B
Source: e-GMAT
Sum of First \(n +\)ve odd integers is \(n^2\)
Sum of First \(n +\)ve even integers is \(n(n+1)\)
If we take the scenario for first 5 even/odd numbers
First \(5 +\)ve odd integers would be 25 which is \(K\) here
First \(5 +\)ve even integers would be \(5\cdot 6 = 30\) (Here "0" is not counted)
"0" is considered as a non-positive and non-negative even integer. and hence will go with \(K-N\).
