The general term for the arithmetic sequence is aₙ = 3 + 3n
The general term of an arithmetic sequence is as follows:
aₙ = a + (n - 1)d
where
Therefore,
a = 6
d = 9 - 6 = 3
aₙ = 6 + (n - 1)3
aₙ = 6 + 3n - 3
aₙ = 3 + 3n
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