Question

Why we replace it by 2m-1 not by only m-1
Bcoz acc.to An formula an=a+(n-1)d. SO it have to be replaced by only m-1
Plzzz answer

Answer 1

Answer:

Step-by-step explanation:

This is becuse you cannot minus 2 directly from 2. See for example :

N= 2m-1 ,if m = 3 then ,

= 2(3)-1=5

But m-1 =4 . Hope you understand....

Thank you and sorry if u are not able to understand