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

Explanation

To find the 20th term of the sequence defined by \( a_n = (n-1)(2-n)(3+n) \), we will substitute \( n = 20 \) into the formula and simplify.

**Step 1: Substitute \( n = 20 \) into the formula.**

\[ a_{20} = (20 - 1)(2 - 20)(3 + 20) \]

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