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Answer:
f(5) = 15
Step-by-step explanation:
f(2) = f(2-1) + 3
= f(1) + 3
= 3 + 3
= 6
f(3) = f(3-1) +3
= 6 + 3
= 9
f(4) = f (4-1) + 3
= 9 + 3
= 12
f(5) = f(5-1) + 3
= 12 + 3
= 15