Math, asked by Rinska, 11 months ago

1+2+3+......+(n-1)=?

Answers

Answered by brunoconti

3

Answer:

Step-by-step explanation:

= n(n - 1)/2

brunoconti: thks

Answered by Wsadqwerty1

2

$\frac{ {n}^{2} - n }{2}$

this is the solution

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