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I have a question need help
Why can't we use sum of 1-301 minus sum of 1-99, then we will get 301*302/2-99*100/2=40501, why it is wrong?
- by jonathanjing
Sun Sep 16, 2012 9:31 pm- Forum: Problem Solving
- Topic: For any positive integer n, the sum of
- Replies: 7
- Views: 4060