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The sum of the first 50 positive even integers is 2,550.

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The sum of the first 50 positive even integers is 2,550.  [#permalink] New post 24 Aug 2007, 07:17
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The sum of the first 50 positive even integers is 2,550. What is the sum of the even integers from 102 to 200, inclusive?

a. 5,100
b. 7,550
c. 10,100
d. 15,500
e. 20,100
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Re: Sum of Integers PS [#permalink] New post 24 Aug 2007, 07:29
JamieK wrote:
The sum of the first 50 positive even integers is 2,550. What is the sum of the even integers from 102 to 200, inclusive?

a. 5,100
b. 7,550
c. 10,100
d. 15,500
e. 20,100


i get B 7,550

first find the average of 102 and 200, then find the number of integers, and find the product of the two.

average: (102 + 200) / 2 = 151
# of int (since they are asking for even int): (200-102)/2 + 1 = 50

151 * 50 = 7,550

Last edited by beckee529 on 24 Aug 2007, 07:41, edited 1 time in total.
Re: Sum of Integers PS   [#permalink] 24 Aug 2007, 07:29
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