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U₂ = S₂ - S₁ = [2(2)² - 5(2)] - [2(1)² - 5(1)] = 1
Beda b = U₂ - U₁
b = 1 - (- 3) = 4
Jadi lima suku pertama adalah
- 3, 1. 5, 9, 13