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!
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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