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OfflinePicklez
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find a sum using sigma notation- MATH HELP
    #160569 - 12/11/08 12:23 PM (15 years, 3 months ago)

alright, I need some math help if there is anyone out there willing to throw me a bone here

30
E (5k+3)
k=1

The "E" is the Sigma sign. I need to find the sum of terms 1-30.

I know the long method but I know there is a short way to solve this problem, any help is greatly appreciated

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OfflinePicklez
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
    #160723 - 12/11/08 06:45 PM (15 years, 3 months ago)

bump, no one?

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OfflineCoaster
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
    #160731 - 12/11/08 06:56 PM (15 years, 3 months ago)

lol no1 is gonna help u
and i would if u werent such a dick 2 me
such an ez problem :lol:


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InvisibleOmbient
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
    #160734 - 12/11/08 06:59 PM (15 years, 3 months ago)

the right equations you need should all be in your book. find out if its geometric or arithmetic, I guess right? then plug into the correct equation for sum of terms. :shrug:

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OfflinePicklez
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Re: find a sum using sigma notation- MATH HELP [Re: Ombient]
    #160743 - 12/11/08 07:27 PM (15 years, 3 months ago)

Quote:

Omni said:
the right equations you need should all be in your book. find out if its geometric or arithmetic, I guess right? then plug into the correct equation for sum of terms. :shrug:




I dont have a math book :frown:

But fine, I will spend the next hour trying to do this problem. I got nothing but time on my hands

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OfflineCoaster
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
    #160744 - 12/11/08 07:45 PM (15 years, 3 months ago)

my hands smell like kush n pussy


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InvisibleOmbient
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Re: find a sum using sigma notation- MATH HELP [Re: Picklez]
    #160750 - 12/11/08 08:00 PM (15 years, 3 months ago)

its arithmetic (diff of +5)...eq's for arithmetic sequences:

eq. to find whatever term

"where a1 is the first term of the sequence,
d is the common difference, n is the number of the term to find."


eq for sum of certain number of terms

"where Sn is the sum of n terms (nth partial sum),
a1 is the first term,  an is the nth term."

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OfflinePicklez
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Re: find a sum using sigma notation- MATH HELP [Re: Ombient]
    #160752 - 12/11/08 08:05 PM (15 years, 3 months ago)

Thank you, I know that first formula pretty well, but dont think I have used the 2nd one before

Thanks!

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