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

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Joined: 31 Oct 2007
Posts: 111
Location: Frankfurt, Germany
The sum of the first 100 positive integers is 5,050. What is  [#permalink]

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05 Apr 2008, 22:23
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19. 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

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Jimmy Low, Frankfurt, Germany
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Joined: 10 Jun 2007
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Re: 1000PS: Section 7 Question 19  [#permalink]

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05 Apr 2008, 22:47
2
jimmylow wrote:
19. 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

E.

Sum = Average * Number of integers
Average = (1+200)/2
Number of integers = 200-1+1 = 200
Sum = (1+200)/2 * 200 = 201*100 = 20100
Director
Joined: 14 Oct 2007
Posts: 718
Location: Oxford
Schools: Oxford'10
Re: 1000PS: Section 7 Question 19  [#permalink]

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06 Apr 2008, 09:04
bkk145 wrote:
jimmylow wrote:
19. 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

E.

Sum = Average * Number of integers
Average = (1+200)/2
Number of integers = 200-1+1 = 200
Sum = (1+200)/2 * 200 = 201*100 = 20100

kudos..

great explanation, I was doing this the long way
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Joined: 09 Sep 2013
Posts: 10949
Re: The sum of the first 100 positive integers is 5,050. What is  [#permalink]

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10 Aug 2017, 04:58
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--== Message from the GMAT Club Team ==--

THERE IS LIKELY A BETTER DISCUSSION OF THIS EXACT QUESTION.
This discussion does not meet community quality standards. It has been retired.

If you would like to discuss this question please re-post it in the respective forum. Thank you!

To review the GMAT Club's Forums Posting Guidelines, please follow these links: Quantitative | Verbal Please note - we may remove posts that do not follow our posting guidelines. Thank you.

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Re: The sum of the first 100 positive integers is 5,050. What is   [#permalink] 10 Aug 2017, 04:58
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