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find the 15th term of the sequence
-9,27,-81............

  • math -

    sequence is ar^n where a=-9, r=(-3)^n

    15 term> is -9 the zeroth term, or first. Let it be first, then r=(-3)^(n-1)
    so 15th term...(-9)(-3)^14=-43 046 721

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