What is the sum of 20 consecutive integers from -9 inclusive, in a increasing order?  Choose the correct choice
A) -9 B) 9 C) -10 D) 10 E) 20
From -9 to -1 --&gt; 9 nos.   zero --&gt; 1 number   from +1 to +9 --&gt; 9 nos.   When we add up nos. from -9 to +9 sum will be zero. Total 19 nos will be added.   20th number will be 10.   Sum of these 20 nos. = 10.   10 is the answer.
<result>D</result>
What is the sum of 20 consecutive integers from -9 inclusive, in a increasing order?