Sum of new number of term is n^2+3n. Then find 20th term
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Answer: 44
Step-by-step explanation:
S₂₁ = (21)²+3(21) = 441 + 63 = 504
S₂₀ = (20)² + 3(20) = 400 + 60 = 460
A₂₁ = S₂₁ - S₂₀ = 504 - 460 = 44
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