#### Answer

$20$

#### Work Step by Step

Since we have
$$\lim_{n\to \infty}a_n=\lim_{n\to \infty}20-\frac{4}{n^2}=20$$
then the sequence $a_n$ converges to $20$.

Published by
W. H. Freeman

ISBN 10:
1464125260

ISBN 13:
978-1-46412-526-3

$20$

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