**Evaluate the expression 5C2? | Socratic**
https://socratic.org/questions/evaluate-the-expression-5c2

May 28, 2018 · Explanation: Combination formula is denoted by: Cn r = n! r!(n − r)! Just substitute in r = 2 and n = 5, C5 2 = 10. This can also be seen from Pascal's triangle where, Answer link. Jim G.

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