For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the integers between 1 and 50? Choose the correct answer
A) 1275
B) 1542
C) 985
D) 1024
E) 1125
sum = 50*51/2 = 25*51= 
<gadget id="calculator">25*51</gadget>
<output>1_275</output>
1275   1275nswer is 1275
<result>A</result>
For any positive integer n, the sum of the first n positive integers equals n(n+1)/2. What is the sum of all the integers between 1 and 50?