Respuesta:
Explicación paso a paso:
n(n - 3)/2 = 6(6 - 3)/2
= 6*3/2
= 18/2
= 9
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Verified answer
Respuesta:
Explicación paso a paso:
n(n - 3)/2 = 6(6 - 3)/2
= 6*3/2
= 18/2
= 9