# Chapter 9 - Section 9.2 - Arithmetic Sequences - 9.2 Assess Your Understanding - Page 654: 16

common difference = $1$ The first four terms are: $1, 2, 3, 4$

#### Work Step by Step

To find the first four terms, substitute $1, 2, 3, 4$ for $n$ in the given formula; then, use the rule $e^{(\ln{n})} = n$ to simplify. $s_1 = e^{\ln{1}} = 1$ $s_2= e^{\ln{2}}=2$ $s_3 = e^{\ln3} = 3$ $s_4 = e^{\ln4}=4$ The terms increase by $1$ unit, so the sequence is arithmetic with a common difference of $1$.

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