What is the sum of odd integers from 20 to 80, inclusive? Choose one:
A) 1,550  B) 1,500  C) 1,240  D) 1,120  E) 1,100
Number of odd integers = (80-20)/2 + 1   = 60/2 + 1= 
<gadget id="calculator">60/2 + 1</gadget>
<output>31</output>
31   Sum of odd integers= (20+80)/2 * 31   = 50 * 31= 
<gadget id="calculator">50 * 31</gadget>
<output>1_550</output>
1550   1,550nswer 1,550
<result>A</result>
What is the sum of odd integers from 20 to 80, inclusive?