Algebra functii/combinatorica Numărul funcțiilor injective f : {1, 2} «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#8594;«/mo»«/math» {1,2, ... #n} este egal cu: {#1}

2) Numărul funcțiilor neinjective f : {1, 2} «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#8594;«/mo»«/math» {1,2, ... #m} este egal cu: {#2}ă

3) Numărul tuturor funcțiilor f : {1, 2} «math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mo»§#8594;«/mo»«/math» {1,2, ... #n} este egal cu: {#3}

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