What is the 20th term of the sequence defined by a_n = (n - 1) (2… - Vidyadip

Question

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

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Answer

Here, $n = 20,$
$\therefore a_{20} = (20 - 1) (2 - 20) (3 + 20)$
$= 19 \times (- 18) \times (23) = - 7866.$

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