combinatorics
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com·bi·na·tor·ics | \ ˌkäm-bə-nə-ˈtȯr-iks 
, -ˈtär-, kəm-ˌbī-nə-, -(ˌ)bi- \
, -ˈtär-, kəm-ˌbī-nə-, -(ˌ)bi- \Definition of combinatorics
: combinatorial mathematics
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The first known use of combinatorics was in 1941
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