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What is the 20^ (th) term of the sequen...

What is the `20^ (th) ` term of the sequence defined by `a_n=(n-1)(2-n)(3+n) ?`

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Putting `n=20`, we obtain
`a_29=(20-1)(2-20) cdot(3+20) doteq 19 xx(-18) xx(23)=-7866`
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V PUBLICATION-SEQUENCES AND SERIES-QUESTIONBANK
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