The sum of the first 100 positive integers is 5,050. What is the sum of the first 200 positive integers?
Answer Choices:
(A) 10,100
(B) 10,200
(C) 15,050
(D) 20,050
(E) 20,100
Submission is closed.
Answer:
Mei Li's answer:
(E) 20,100
The first sentence is irrelevant to finding the answer. To find the sum of a sequence of integers, add the first integer (1) and the last integer (200), then divide the sum by 2. Multiply that number by the number of integers (200).
(1+200)/2 x 200 = 20,100
Winner:
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