I'm still struggling with basic summation evaluation.
I've managed to get a formula like this:
But the 3n is confusing me and I'm not sure what my next step should be.
I think I evaluate down to :
? and then where?
Thanks in advance.
I'm still struggling with basic summation evaluation.
I've managed to get a formula like this:
But the 3n is confusing me and I'm not sure what my next step should be.
I think I evaluate down to :
? and then where?
Thanks in advance.