Question

help.
i need answer to this :(

Answer 1

Go to https://www.mathway.com/ because they'll give you the answer and the explanation. :)

Answer 2

I have to be on my way otherwise I'd help you. Good luck! :)

Answer 3

Help me please. :(

Answer 4

I'd strongly suggest that you write out the first four or five terms of this sum. There may be a pattern whereby most of the terms cancel one another.