[tex] \frac{ \not 3 ^{1} n(n - 1)}{ \not6_2 } = \frac{n(n - 1)}{2} \\ \frac{n(n - 1)}{2} =\frac{n(n - 1)}{2} [/tex]
[tex]n \in~R[/tex]
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[tex] \frac{ \not 3 ^{1} n(n - 1)}{ \not6_2 } = \frac{n(n - 1)}{2} \\ \frac{n(n - 1)}{2} =\frac{n(n - 1)}{2} [/tex]
[tex]n \in~R[/tex]