Question:
Find the indicated terms in each of the sequences in Exercises 7 to 10 whose $n^{\text {th }}$ terms are :
$a_{n}=\frac{n^{2}}{2^{n}} ; a_{7}$
Solution:
Here, $a_{n}=\frac{n^{2}}{2^{n}}$.
Substituting $n=7$, we obtain
$a_{7}=\frac{7^{2}}{2^{7}}=\frac{49}{128}$