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

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

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New post 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
Blog: http://mytrainmaster.wordpress.com
GMAT Malaysia: http://gmatmalaysia.blogspot.com

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Re: 1000PS: Section 7 Question 19 [#permalink]

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New post 05 Apr 2008, 22:47
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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

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Re: 1000PS: Section 7 Question 19 [#permalink]

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New post 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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Re: The sum of the first 100 positive integers is 5,050. What is [#permalink]

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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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