Question: Use the Y combinator to write a function sum that will calculate the sum of numbers 0+1+2++n. Use only Y,f,n, if, iszero, Z, plus, pred,

Use the Y combinator to write a function sum that will

Use the Y combinator to write a function sum that will calculate the sum of numbers 0+1+2++n. Use only Y,f,n, if, iszero, Z, plus, pred, and parentheses. Complete the template: sum=Y(fn

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