Which recursive formula can be used to define this sequence for n > 1?
9, 12, 15, 18, 21, 24, ...
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f(n) = f(n − 1)
f(n) = f(n-1) + 3
f(n) = f(n − 1)
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f(n) = f(n-1) + f(n − 2) + 3