N(n-1)/2=36

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Solution for N(n-1)/2=36 equation: 



(N-1)/2=36

We move all terms to the left:

(N-1)/2-(36)=0

We multiply all the terms by the denominator


(N-1)-36*2=0

We add all the numbers together, and all the variables

(N-1)-72=0

We get rid of parentheses

N-1-72=0

We add all the numbers together, and all the variables

N-73=0

We move all terms containing N to the left, all other terms to the right

N=73

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