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01-10-2016
Mathematics

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find the sum of - 1/3 - 4/5

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kittycat01 kittycat01

01-10-2016

hope this helps
1/(2*3) can be written as 1/2 - 1/3.
1/(3*4) can be written as 1/3 - 1/4.

And so on until
1/(49*50) can be written as 1/49 - 1/50.

When you add up this series, you get 1/2 - 1/50, which is 24/50 which is 12/25.

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