# Sigma Notation

• June 8th 2010, 08:58 PM
nuckers
Sigma Notation
How do you find how many terms this has if the lower limit is k=b and the upper limit is b+12, i know you subtract them and add 1, but i'm not sure how to do it with this

Thanks
• June 8th 2010, 09:31 PM
Prove It
Quote:

Originally Posted by nuckers
How do you find how many terms this has if the lower limit is k=b and the upper limit is b+12, i know you subtract them and add 1, but i'm not sure how to do it with this

Thanks

What are we trying to sum?
• June 8th 2010, 09:41 PM
nuckers
not trying to sum anything up, just asking for the number of terms in each series

not sure how this is typed on here but i'll try and explain it

sigma sign, on the top is b+12 and on the bottom is k=b, and the equation is 3n-7
• June 8th 2010, 09:42 PM
Prove It
Quote:

Originally Posted by nuckers
not trying to sum anything up, just asking for the number of terms in each series

not sure how this is typed on here but i'll try and explain it

sigma sign, on the top is b+12 and on the bottom is k=b, and the equation is 3n-7

If the counter starts at $b$ and ends with $b + 12$, how many terms are there?
• June 8th 2010, 09:47 PM
nuckers
Quote:

Originally Posted by Prove It
If the counter starts at $b$ and ends with $b + 12$, how many terms are there?

12 terms?
• June 8th 2010, 09:49 PM
Prove It
Quote:

Originally Posted by nuckers
12 terms?

No, 13. You've forgotten the starting term.
• June 8th 2010, 09:53 PM
nuckers
Quote:

Originally Posted by Prove It
No, 13. You've forgotten the starting term.

oops, that would explain the +1, got a little confused with the K=b and the b+12
Thank you