In mentioned below 15th  question of GP of excise 11(D) while calculating "n" why dint we take mod for "r" 

Or 

Why dint we take "r " Greater than one 

Asked by nandakattimani226 | 28th Jan, 2020, 07:40: AM

Expert Answer:

We are considering |r| in case of infinite series. 
In the question we need to find terms whose sum is given. So, the given series is finite.
Hence, we need to take r without mod.

Answered by Sneha shidid | 28th Jan, 2020, 10:43: AM