The sum of the first 40 positive even integers is 1,640. What is the sum of the first 40 odd integers? Pick:
A) 1500 B) 1600 C) 1400 D) 1200 E) 1000
Sum of first n even numbers = n(n+1) =1640   Sum of first n odd numbers = n^2 = 40*40= 
<gadget id="calculator">40*40</gadget>
<output>1_600</output>
1600 (here n=40)   Answer : 1600
<result>B</result>
The sum of the first 40 positive even integers is 1,640. What is the sum of the first 40 odd integers?