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Let f:N x N -> N be the function defined recursively as follows:
f(0, 0) = 6
f(i, j) = f(i - 1, j) + 2 if i > 0 and j = 0
f(i, j) = f(i, j - 1) + 1 if j > 0
Use induction on the sum i + j to prove that f(i, j) = 2i + j + 6 for all (i, j) in N x N.
Statistics and Probability, Statistics
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