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03 Apr 2010, 10:57
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Hi guys!
Could you please explain how to solve this problem?
What is the sum of integers presented in attached file?
(I do not know how to post a table here)
thanks.
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03 Apr 2010, 11:21
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1. Each row is n* (1+2+3...+7) where n e {1,-2,3,-4..,7}
2. Let's add all rows: Sum = (1-2+3-4+5-6+7)*(1+2+3+4+5+6+7) = 4*(3*8+4) = 4*28 = 112
EDITED: typo
2. Let's add all rows: Sum = (1-2+3-4+5-6+7)*(1+2+3+4+5+6+7) = 4*(3*8+4) = 4*28 = 112
EDITED: typo
04 Apr 2010, 06:18
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walker
4*28 = 112 typo?
I think this is a less than 30 sec question
