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Math Help - Sequences and Series - summation notation

  1. #1
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    Post Sequences and Series - summation notation

    1. Determine the approximate value of Sequences and Series - summation notation-4-3_quiz_2a_cbel.gif


    2. Evaluate Sequences and Series - summation notation-4-3_quiz_2a_cbel.jpg

    3. Find the value of the 8th term of the series Sequences and Series - summation notation-sigma_4to22.gif 9(4)j - 6.
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  2. #2
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    Quote Originally Posted by danield3 View Post
    1. Determine the approximate value of Click image for larger version. 

Name:	4-3_quiz_2a_cbel.gif 
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ID:	16675


    2. Evaluate Click image for larger version. 

Name:	4-3_quiz_2a_cbel.jpg 
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ID:	16676

    3. Find the value of the 8th term of the series Click image for larger version. 

Name:	sigma_4to22.gif 
Views:	89 
Size:	154 Bytes 
ID:	16677 9(4)j - 6.
    Do you understand what \sum means? What have you tried and where are you stuck?
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  3. #3
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    Quote Originally Posted by mr fantastic View Post
    Do you understand what \sum means? What have you tried and where are you stuck?
    I do not know how to do it. Can you help me.
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  4. #4
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    Quote Originally Posted by danield3 View Post
    I do not know how to do it. Can you help me.
    It would help if you had answered the two questions I asked you (or at leats the first question).

    Q1 By definition: \sum_2^8 3^{k-1} = 3^1 + 3^2 + 3^3 + 3^4 + 3^5 + 3^6 + 3^7 = ..... and you can go to a calculator and evaluate. Alternatively, if you've been taught about geometric series, you can use the usual formula to evaluate it (a = 3, r = 3, n = 7).

    The other two are left for you to attempt. Please show what you have done. Say where you are stuck.
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