72 = 8 * 9

We know that 8 = 2^3 and that 9 = 3^2

Thus, 72 = 2^3 * 3^2 = 2^x * 3^y

From that we can see that x = 3 and y = 2, so x + y = 5. Tada!

72 = 8 * 9

We know that 8 = 2^3 and that 9 = 3^2

Thus, 72 = 2^3 * 3^2 = 2^x * 3^y

From that we can see that x = 3 and y = 2, so x + y = 5. Tada!

42 that's my final answer.

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