The sum of the first 80 positive even integers is 6480. What is the sum of the first 80 odd integers? Choose the correct choice from the following choices
A) 6200 B) 6300 C) 6400 D) 6500 E) 6600
Sum of first n even numbers = n(n+1) =6480   Sum of first n odd numbers = n^2 = 80*80= 
<gadget id="calculator">80*80</gadget>
<output>6_400</output>
6400 (here n=80)   Answer : 6400
<result>C</result>
The sum of the first 80 positive even integers is 6480. What is the sum of the first 80 odd integers?