How to find a relation between given numbers to get a given result?

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I have

f(2, 3, 6)  =  5/6;
f(4, 3, 12) = 17/6;
f(3, 3, 9)  = 11/6;
f(2, 0, 2)  =  2;

How can I find the relation f for the given values?