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An investor has 20000 to invest among 4 possible investments. Each investment must be a unit of 1000. If the total 20,000 must be invested, how many different investment strategies are possible? What if not all money need to be invested?

I should solve ${\binom{20000+4-1}{20000}}$? I think I need something with the 1000.

I should solve ${\binom{20000+4-1}{20000}}$? I think I need something with the 1000.

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