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Algebra

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Finding Formula of a Sequence

ALGEBR-GZSKPM

Find the formula for the arithmetic sequence with a common difference of $9$ and first term equal to $28$.

A

$a_{n}=28+9(n-1)$

B

$a_{n}=28+9n$

C

$a_{n}=9+28n$

D

$a_{n}=9+28(n-1)$

E

none of the above