Answer: f(5)= 10
Explanation:
f (n + 1) = f(n) – 2.
If f(1) = 18, then:
f(2) = f(1) – 2 = 16
f(3) = f(2) – 2 = 14
f(4) = f(3) – 2 = 12
f(5) = f(4) – 2 = 10
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