Find the common difference of the ap whose nth term is An=1+(-2)^n/n-1Its urgent guyzz???

Find the common difference of the ap whose nth term is An=1+(-2)^n/n-1

1.	Find the common difference of the ap whose nth term is An=1+(-2)^n/n-1Its urgent guyzz???
Answer» Put n=1 and n=2.hence finding a2 -a1,you will get d Steps pls -17/2