If S_n denotes the sum of first n terms of an A.P., prove that S₃₀ = 3(S₂₀ - S₁₀).
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If S_n denotes the sum of first n terms of an A.P., prove that S₃₀ = 3(S₂₀ - S₁₀).

KnowledgeBoat · Accepted Answer

By formula S_n = We need to prove S₃₀ = 3(S₂₀ - S₁₀). ∴ L.H.S. = R.H.S. = 30a + 335d. Hence, proved that S₃₀ = 3(S₂₀ - S₁₀).

Mathematics