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Recursionhard
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A recursive function is defined as f(n)=∑i=0n−1f(i)f(n) = \sum_{i=0}^{n-1} f(i)f(n)=∑i=0n−1​f(i) for n≥1n \ge 1n≥1 with f(0)=1f(0) = 1f(0)=1. What is the value of f(4)f(4)f(4)?