Question
Question: If \(\frac { 1 } { 1 ^ { 2 } }\)+ \(\frac { 1 } { 2 ^ { 2 } }\) + \(\frac { 1 } { 3 ^ { 3 } }\)+ …....
If 121+ 221 + 331+ …. to ¥ = 6π2 , then121+ 321 + 531 + ….. equals-
A
8π2
B
12π2
C
3π2
D
None of these
Answer
8π2
Explanation
Solution
121 + 321 + 521 + …… ¥
= –
= 6π2– 41 = 6π2– 41 .6π2=8π2