🧮!
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#binomial coefficient
#factorial
#enumeration
#counting principles
#combinatorial identities
✌️C✌️=1️⃣
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#combinatorics
#choose function
#nCr
#binomial coefficient
#2 choose 2
🔢C🔢
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#combinations
#combinatorics
#nCr
#binomial coefficient
#choosing items
#binomial coefficient #factorial #enumeration #counting principles #combinatorial identities