The answer to the problem you posted is 70.
So check the problem again. Is it correct?
If so, the given answer is wrong. It goes with .
Hi, I'm taking AS Maths Core 1 in January. I am stuck on a question in the text book.
It goes like this:
Calculate:
5
Sigma r(r+1)
r = 0
The answer in the text book is 112 but I can't get that. I get 70 as an answer. I would really appreciate any help with how to solve this particular problem.]
Thanks in advance,
j