(n^2-n)/2

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Solution for (n^2-n)/2 equation: 


n in (-oo:+oo)

(n^2-n)/2 = 0

n^2-n = 0

n*(n-1) = 0

n-1 = 0 // + 1

n = 1

n*(n-1) = 0

(n*(n-1))/2 = 0

( n-1 )

n-1 = 0 // + 1

n = 1

( n )

n = 0

n in { 1, 0 }

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