Answer
$-\frac{1}{3}$
Work Step by Step
The difference between each pair of consecutive terms is called the common difference.
Common difference $d=3\frac{2}{3}-4=3\frac{1}{3}-3\frac{2}{3}=3-3\frac{1}{3}=-\frac{1}{3}=-\frac{1}{3}$
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