SOLUTION: So I understand how summation and series sequences work but I came across a homework problem that stumped me. I can generally write a sum in summation notation really quickly but I
Question 812881: So I understand how summation and series sequences work but I came across a homework problem that stumped me. I can generally write a sum in summation notation really quickly but I need help with the following.
Write each sum in summation notation: 1-2+3-4+...+(-50)
I get that x=1 goes under the sigma notation and 50 goes above it but I am not able to figure out what the formula is. If you could help me I would greatly appreciate it. Thank You Found 2 solutions by htmentor, ewatrrr:Answer by htmentor(1343) (Show Source): You can put this solution on YOUR website! This series consists of consecutive integers, but the sign alternates.
-1 raised to an even power is +1 and -1 raised to an odd power is -1. So the following summation notation will reproduce the given series:
Check:
The 1st term is
The 2nd term is
and so on... Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Hi
Write each sum in summation notation: 1-2+3-4+...+(-50)
When dealing with alternating + and - numbers, often used