Question: I. Write a scheme function (tribonacci n). The tribonacci numbers Ti are defined as T 0 = T 1 = 0, T 2 = 1,

I. Write a scheme function (tribonacci n). The tribonacci numbers Ti are defined as T₀ = T₁ = 0, T₂ = 1, and T_N = T_N-1 + T_N-2 + T_N-3. (tribonacci n) should return Tn. tribonacci and any helper functions must be tail recursive.

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