HI Alan,
this is beautiful, thank you vwery much.
I do however have 2 questions please...
I would have mistakenly re-written the first term as 1,5+∑10k=31k
and then from here ∑10k=11k−1,5
This would have been completely wrong, and would not lead me in any way towards the end?
I have never seen the upper limit changed, as you have done?...Would ytou kindly just explain that to me, and just one thing more: The second term is re-written as 1k−1+19
I'm looking hard here but fail to see how you got to that?...Thank you for your time..