Please help me on this arithmetic sequence, finding the number of terms....thank you

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  1. WoopWoop1212's Avatar
    1 18-04-2012  19:20
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    Please help me on this arithmetic sequence, finding the number of terms....thank you
    The arithmetic sequence 2,6,10

    The last term of the sequence is 90, what is the the number of terms in the sequence?

    Please explain how to work out this question, I'm stuck

    Thank you
  2. vinvinvin's Avatar
    2 18-04-2012  19:23
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    • Posts: 106
    Re: Please help me on this arithmetic sequence, finding the number of terms....thank
    Ur=a+(r-1)d

    d= common difference
    a= 1st term
    r= the term of the sequence

    you know that Ur=90 so to find r sub in your other values and solve for r
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