n*(N-1)/2=300

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Solution for n*(N-1)/2=300 equation: 


x in (-oo:+oo)

(n*(N-1))/2 = 300 // - 300

(n*(N-1))/2-300 = 0

(n*(N-1))/2+(-300*2)/2 = 0

n*(N-1)-300*2 = 0

N*n-n-600 = 0

(N*n-n-600)/2 = 0

(N*n-n-600)/2 = 0 // * 2

N*n-n-600 = 0

x belongs to the empty set

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