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Question: consider the equation xi x2 x3 x4 ...

Question details

Consider the equation xi + X2 + X3 +X4 + X5 15. How many nonnegative integer solutions does it have? How about positive integer solutions? How many nondecreasing functions f: {1,2,...,15) -> {1,2,3,4,5) are there? Hint: oranges and boxes.

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