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How many ways can you add up to 20 - The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac

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1. With "Natural Number", taking N={1,2,3,...}, you can add up to 20 in 19 ways.
ie. 1+19, 2+18, 3+17, ..., 18+2, 19+1.

2. Taking any integers (positive or negative), there are infinite no. of ways to add up to 20.
ie. -1+21, -2+22, ..., -20000+20020, etc.

Posted on Sep 13, 2009

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