2+3+4+....+(n-1)= (1) n-2 (2)n+(n+1)/2 (3)(n+1)(n-2)/2 (4)n(n-2)/2

1.	2+3+4+....+(n-1)= (1) n-2 (2)n+(n+1)/2 (3)(n+1)(n-2)/2 (4)n(n-2)/2
Answer» n+1 *Hope* it HELPS you *thanks*

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n+1

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2+3+4+....+(n-1)= (1) n-2 (2)n+(n+1)/2 (3)(n+1)(n-2)/2 (4)n(n-2)/2​

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2+3+4+....+(n-1)= (1) n-2 (2)n+(n+1)/2 (3)(n+1)(n-2)/2 (4)n(n-2)/2