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What is the scope including 1/21+1/12+1/13+......+1/30?

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by Max@Math Revolution » Fri Jul 08, 2016 8:48 pm
What is the scope including 1/21+1/12+1/13+......+1/30?
A 1/6~1/5
B. 1/5~1/4
C. 1/4~1/3
D. 1/3~1/2
E. 1/2~1

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by Max@Math Revolution » Mon Jul 11, 2016 5:21 pm
The sum of sequence is determined by the first and the last number. So, 1/3=10/30<1/21+1/12+1/13+......+1/30<10/21<10/20=1/2. The correct answer is D
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