Math Is Fun Forum

coolbee

Member

Registered: 2016-04-05

Posts: 19

arithmetic mean

Find the arithmetic mean of the series

.

The question doesn't specify the value of n ,i.e,whether it is natural number or something else.
If we take n=3 for 3rd term it comes out to be 2^3 and not 2^7.Help.

Bob

Administrator

Registered: 2010-06-20

Posts: 10,643

Re: arithmetic mean

hi coolbee,

At first sight, I thought geometric series

http://www.mathsisfun.com/algebra/seque … etric.html,

but then the third term would need to be 2^3 not 2^7.

So I don't follow what the general rule could be here.  Could that be a misprint?

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

coolbee

Member

Registered: 2016-04-05

Posts: 19

Re: arithmetic mean

I think the same.Just wanted to confirm.
thank you.