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Derive the nth term of a sequence

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  1. Mar 23, 2015 #1
    How do i go about deriving a general eqn for the nth term of a sequence provided an eqn of the sum to the nth term is given in terms of n?
     
  2. jcsd
  3. Mar 23, 2015 #2

    phyzguy

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    Rather than give you the answer, try a discrete example. Think of it this way. I know:
    Sum4 = a1+a2+a3+a4
    and I know
    Sum3 = a1+a2+a3 .

    How would I find a4 in terms of Sum4 and Sum3?
     
  4. Mar 24, 2015 #3
     
  5. Mar 24, 2015 #4

    phyzguy

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    Does your blank reply mean you don't know?
     
  6. Mar 24, 2015 #5
    i meant thanks.

    Aceix.
     
  7. Mar 24, 2015 #6

    phyzguy

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    OK. You're welcome.
     
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