The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?

(A) 10,100
(B) 10,200
(C) 15,050
(D) 20,050
(E) 20,100

Highlight to see answer: E

Please post your explanations in the comments below!

One Response to “Sum of First 100 Positive Integers”

pooja says:

the answer should be 20,200.
explanation:
(200+1)/2= 100.5
(200-1)+1= 200
multiplying both the answers,
100.5*200= 20,100

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