Question: written in java Recursion Function. Dr. Chen created a weird function f(n), based on the following rules: 1). If n 3, then f(n) = f(n

written in java
Recursion Function. Dr. Chen created a "weird function f(n), based on the following rules: 1). If n 3, then f(n) = f(n 1) +2f(n 2) +3f(n 3). . Please create a recursive method to implement this function f(n) Please create an iterative method to implement this function
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