sample selectin.Statistics

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The journal lists the 1900 most active kuala lumpur Stock Exchange stock exchange issues. How many samples of three are possible when selected from these 1900 stock?

the answer is 1 141 362 300, but I can' get that exact answer. Any guidance please?

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The number is $$\binom{1900}{3}=1141362300$$ which is a binomial coefficient. It's the number of ways of choosing a subset of $3$ objects from a set of $1900$ distinguishable objects.