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13 February, 13:21

A sequence is n (n - 1)

Which term is 156? The ___th Term

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  1. 13 February, 14:23
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    n (n-1) = 156

    n^2-n=156

    n^2-n-156=0

    (n-13) (n+12) = 0

    so n=13 because it's an ordinary number and can't be negative
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