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The top documents tagged [techniques of good readersa]
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Module 10 Unit 4. Warming up 1 + 2 + 3… + 100 = ? Leading in 1 + 100 , 2 + 99 , 3 + 98 , …… 49 + 52 , 50 + 51 altogether 50 pairs So : Answer =101×50
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