hilby416 hilby416

23-01-2024
Mathematics

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If sₙ denotes the sum of first n terms of an A.P., whose common difference is d, then sₙ₋₂ sₙ₋₁ + sₙ₋₂ (n > 2) is equal to
A. 2d
B. - d
C. d
D. None of these

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