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The sum of the first 50 positive even integers is 2550. what

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The sum of the first 50 positive even integers is 2550. what [#permalink] New post 12 Dec 2006, 06:54
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The sum of the first 50 positive even integers is 2550. what is the sum of the even integers from 102 to 200 inclusive?

A. 5100
B. 7550
C. 10100
D. 15500
E. 20100
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 [#permalink] New post 12 Dec 2006, 07:01
It is B...

There are 50 even intergers between 102-200 inclusive

The average of those intergers is (200+102)/2=151

50*151=7550
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 [#permalink] New post 12 Dec 2006, 07:09
I was wondering if the sum of the first 50 even integer that it gave out has anything to do with solving the prob. :?
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 [#permalink] New post 12 Dec 2006, 07:11
enola wrote:
I was wondering if the sum of the first 50 even integer that it gave out has anything to do with solving the prob. :?


Yes it is interesting that you do not need that info... :)

All you can do from that info is to calculate an average of the first 50 intergers, which in this case equals 51....
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 [#permalink] New post 12 Dec 2006, 08:06
102 + 104 + .....200
= 50 * 100 + [2 + 4 + ..100]
= 5000 + 2550
= 7550
  [#permalink] 12 Dec 2006, 08:06
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