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#1 2005-12-15 16:35:37
- Alfred
- Guest
Help with Sigma Notation
I'm new to sigma notation and I'm supposed to put 3 + 6+ 12+ 24 + 48 in it, but I really can't figure out how to do it. I've tried for so long, but nothing I try works. Can come help?
#2 2005-12-15 16:57:30
- MajikWaffle
- Member
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Re: Help with Sigma Notation
n <- end of the sequence
Σ (Equation)
k = 1 <- starting
Last edited by MajikWaffle (2005-12-15 16:57:43)
#3 2005-12-15 17:06:00
- Alfred
- Guest
Re: Help with Sigma Notation
I know all that, it's just this problem I can't get.
#4 2005-12-15 17:10:07
- Ricky
- Moderator
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Re: Help with Sigma Notation
Don't ask me how I got this, I couldn't tell you. Just a bunch of guessing and checking:
Summation of k = 1 to n of 2^(k+1) - 2^(k-1)
Last edited by Ricky (2005-12-15 17:11:14)
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
#6 2005-12-15 17:17:15
- Ricky
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Re: Help with Sigma Notation
2^(k+1) - 2^(k-1)
K = 1:
2^2 - 2^0 = 4 - 1 = 3
K = 2:
2^3 - 2^1 = 8 - 2 = 6
K = 3:
2^4 - 2^2 = 16 - 4 = 12
K = 4:
2^5 - 2^3 = 32 - 8 = 24
And so on.
Last edited by Ricky (2005-12-15 17:17:51)
"In the real world, this would be a problem. But in mathematics, we can just define a place where this problem doesn't exist. So we'll go ahead and do that now..."
#7 2005-12-15 17:52:46
- MathsIsFun
- Administrator
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Re: Help with Sigma Notation
Is this it?
Code:
[math]\sum_{k=1}^\infty2^{k+1}-2^{k-1}[/math]"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman
#10 2005-12-15 22:52:44
- MathsIsFun
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Re: Help with Sigma Notation
It is "LaTeX" and I don't know it very well.
Just found this though
"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman