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Math Help - Arithmetic sequences

  1. #1
    Member M670's Avatar
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    Arithmetic sequences

    For the arithmetic sequence with given first term 2 and common difference 3:
    its th term is ;
    its 10-th term is .

    I am not sure how to proceed I thought the nth term would be 3n and the 10th term 30 but I was wrong?
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  2. #2
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    Awetuouncsygg
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    Re: Arithmetic sequences

    r is the common difference:

    a_n=a_1+(n-1)r=2+3(n-1)=3n-1

    a_{10}=a_1+9r=2+27=29
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  3. #3
    Member M670's Avatar
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    Re: Arithmetic sequences

    Ok now I understand it abit more thank you
    and nice use of LaTeX
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