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Q10. DIRECTIONS for question 10: Type in your answer in the input box provided below the question.
For all non-negative integers x and y, if
f(x,y) = f (x - 1,f(x,y - 1));
f(0, y) = y + 1;
f (x + 1,0) = f (x, 1).
find the value of f(1,2).
Correct Answer:4


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