Maritza added p_For_example_span_class__.html  over 8 years ago

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For example, \(S\left(3,2\right)\)\(=3\), because there are three ways to  partition three objects, namely \(a,b\) and \(c\) into two groups. \(\left(a\right)\left(bc\right),\left(b\right)\left(ac\right)\) and \(\left(c\right)\left(ab\right).\)