Published by:
CGP EDU Academic Team
Published on: August 12, 2026
The sum 
, is maximum when m is
Text Solution
Verified by ExpertsThe correct answer is:
B
For m 
for m = 10, 
,
for m = 15, 
and for m = 20, 
Clearly, the sum is maximum for m = 15.
Note that 
is maximum for r = 5 and 
is maximum for r = 10. Note that the single term 
(in case m = 15) is greater than the sum
(in case m = 10).
Also the sum in case m = 10 is same as that in case m = 20.
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