Which sequence is generated by the function f(n + 1) = f(n) – 2 for f(1) = 10?

The first term is f(1) = 10. Each next term is 2 less than the previous term: 10 − 2 = 8, then 8 − 2 = 6, followed by 4 and 2. So the sequence is 10, 8, 6, 4, 2, ...; this is choice D.

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