- #1
oddjobmj
- 306
- 0
Hello,
I'm having some issues solving some apparently 'basic' summation problems where they give you a couple summations and you derive the missing summation.
I would appreciate any help not only solving this particular question but actually understanding the situation.
Thanks!
Suppose:
113
[tex]\Sigma[/tex] ak = 641
k=9
and
507
[tex]\Sigma[/tex] ak = 2091
k=70
and
113
[tex]\Sigma[/tex] ak = 130
k=70
Then:
507
[tex]\Sigma[/tex] ak = ?
k=114
I think everything relevant is provided above.
I have absolutely no idea how to start. I've googled summation problems and read quite a bit more than what is in my text. I keep finding information on what I can already do; problems like:
10
[tex]\Sigma[/tex] a-20 = ?
k=1
Where a is a constant instead of having the 'k' subscript so you can take (10-(1-1)) * (a-20).
Although, for some reason sticking the subscript onto a throws me off completely. Any suggestions are welcome.
Thank you for your time!
I'm having some issues solving some apparently 'basic' summation problems where they give you a couple summations and you derive the missing summation.
I would appreciate any help not only solving this particular question but actually understanding the situation.
Thanks!
Homework Statement
Suppose:
113
[tex]\Sigma[/tex] ak = 641
k=9
and
507
[tex]\Sigma[/tex] ak = 2091
k=70
and
113
[tex]\Sigma[/tex] ak = 130
k=70
Then:
507
[tex]\Sigma[/tex] ak = ?
k=114
Homework Equations
I think everything relevant is provided above.
The Attempt at a Solution
I have absolutely no idea how to start. I've googled summation problems and read quite a bit more than what is in my text. I keep finding information on what I can already do; problems like:
10
[tex]\Sigma[/tex] a-20 = ?
k=1
Where a is a constant instead of having the 'k' subscript so you can take (10-(1-1)) * (a-20).
Although, for some reason sticking the subscript onto a throws me off completely. Any suggestions are welcome.
Thank you for your time!