Scheme Exercises

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Group:     Exercise: 12/48 

Max3:  Largest of 3 values

Write a function (max3 a b c) that returns the largest of a b and c.
You may define a max2 function and use it as a helper function to make it clearer and easier.
For instance:
(max3 3 4 5) -> 5
(max3 1 2 2) -> 2