A sequence is defined by the formula f(n+1)=f(n)−3. If f(4)=22, what is f(1)?

Each time n increases by 1, the sequence value decreases by 3. To move backward from f(4)=22 to f(1), add 3 three times: f(3)=25, f(2)=28, and f(1)=31. The correct choice is 31.

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