an=3+4n.Find AP and the sum of 15 terms
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Answer:525. Step-by-step explanation: tₙ = 3 + 4n. So t₁ = 3+4 = 7. t₁₅ = 3 + 4x15 = 63. Sum of first 15 terms, Sₙ = n/2 ...
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