thank you sir for the good job you are doing here on UA-cam, I'm a GCE candidate of this year
Thanks sir I have understood
😃😃nicely explained 👌
Why didn't you use this formula:Sn=a(r^n-1)÷r-1
This so incredible sir
Fantastic mathematician
U are helping sir
Thank you sir cause this questions almost killed me in an exam
Thank sir I have understood
Thank you for this job
Thank you very much sir
Okay this is crazy mathematics 😅🙌
thanks sir😊
Sir how did you find the 20?
Thank you sir
Thank you sir
Thank you sir
thank sir very much for job you done teach G P