Work Step by Step
We know that the general formula of an arithmetic sequence is given by $a_n=a_1+(n-1)d$ Here, we have $d=-3$ $a_n=a_1+(n-1)d$ This gives: $a_n=-1+(n-1) \times (-3)$ or, $a_n=-1-3n+3$ Hence, $a_n=2-3n$
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