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Express the following in Sigma notation

  • Calculus -

    Calculate the difference between successive terms of the sum. The differences are the terms you need to add together to make the sum.

    Sum: 2,8,18,32,50,72...
    diff: 2,6,10,14,18,22...

    0th term=2
    1st term = 6
    2nd term = 10
    The rule is therefore 2+4i
    So check if Σ2+4i works for you. i starts from zero.

  • Correction -

    My answer above applies if the list of numbers were successive sums.
    Go with Reiny's answer:

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