Math, asked by jassisaini31032004, 1 month ago

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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Answered by basharahil55

1

Answer:

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Step-by-step explanation:

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