Question
Find the value of each expression.$${ }_{10} \mathrm{C}_{9}$$
Step 1
This is a combination formula which is defined as: $$ { }_{n} \mathrm{C}_{r} = \frac{n!}{(n-r)!r!} $$ where "n" is the total number of items, "r" is the number of items to choose, and "!" denotes factorial. Show more…
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