Kenneth Rosen Edition 7 Exercise 2.4 Question 2 (Page No. 167)

Question

What is the term $a_{8}$ of the sequence $\{a_{n}\},$ if $a_{n}$ equals

• A. $2^{n−1}$
• B. $7$
• C. $1 + (−1)^{n}$
• D. $−(−2)^{n}$

Answer 1

$n=8$

A).$ 2^{n-1}=2^{7}=128$

B).7

C).$1+(-1)^{n}=1+(-1)^{8}=1+1=2$

D)$.-(-2)^{n}=-(-2)^{8}=-256$