Example 6a Sheldon Ross

How many distinct nonnegative integer-valued solutions of x1 + x2 = 3 are possible?
 

Answer

Things you need to know 

Proposition 6.1 & 6.2 Sheldon Ross (8th edition)

Now,

There are \({3 + 2 - 1 \choose 2 - 1} = 4\) such solutions :  (0, 3), (1, 2), (2, 1), (3, 0).

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