What is the scope including 1/21+1/22+1/23+......+1/30?
Pick:
A) 1/6~1/5
B) 1/5~1/4
C) 1/4~1/3
D) 1/3~1/2
E) 1/2~1
For Maximum value : It should be less than 1/21 + 1/21 +1/21... 10 times = 10/21 ~ 1/2   For Minimum Value : It should be greater than 1/30+ 1/30+ 1/30 .. 10 times = 10/30 = 1/3   Thus, the answer should lie between 1/3 and 1/2. Correct ans : 1/3~1/2.
<result>D</result>
What is the scope including 1/21+1/22+1/23+......+1/30?