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Showing results for tags 'subtracting fractions'.
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hi there in GRE Revised ETS book example said the sequence of numbers a1,a2,a3 ,,,,,,, An is defined by a = 1/n - 1/n+2 for each integer then we have to find the total of adding the first 20 sequence of this ok i know that answer is number B my question is in explaination they said we dont have to add all the 20 sequences , instead its show to add first 2 terms like that (1/1-1/3) + (1/3-1/4) = (1/1+1/2)-(1/3+1/4) i need to know how this equal , i didnt understand why we substitute the signs , and became opposite signs , thanks for help my GRE angels
