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Find the indicated term in the sequence ...

Find the indicated term in the sequence whose `n^ (th) ` term is
`a_n=(-1)^(n-1) n^3 , a_9`

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Putting `n=9`, we have `a_g=(-1)^9 - 1 cdot 9^3=(-1)^8 xx 729=729`
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