# Chapter 14 - Sequences, Series, and the Binomial Theorem - 14.2 Arithmetic Sequences and Series - 14.2 Exercise Set - Page 902: 7

$a_1=7$ $d=-4$

#### Work Step by Step

In an arithmetic sequence, the common difference can be calculated as the difference of any two subsequent terms: $d=a_2-a_1=3-7=-4$ The first term is: $a_1=7$.

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