Limits, Continuity and Differentiability

Section: Mathematics
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Question : 20 of 51
 
Marks: +1, -0
For a,|a|>1,let
lim
n
(
1+32+......+3n
n7/3(
1
(an+1)2
+
1
(an+2)2
+...
+
1
(an+n)2
)
)
=54

Then the possible value(s) of a is/are
[JEE Adv 2019 P2]
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