Question

if an=((-1)^n)/(2n-1) then an is equal to​

Answer 1

Answer:

Step-by-step explanation:

Here T  

n

​  

=2n−1

Thus, Sum, S  

n

​  

=∑T  

n

​  

=2∑n−∑1=2  

2

n(n+1)

​  

−n=n  

2

 

Hence, option 'A' is correct.