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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What is the scope including 1/21+1/12+1/13+......+1/30?
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- Max@Math Revolution
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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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