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U₁₀ = S₁₀ - S₉
= [(10)² - 3(10)] - [(9²) - 3(9)]
= (100 - 30) - (81 - 27)
= 70 - 54
= 16
Jadi, suku ke 10 deret aritmatika tersebut adalah 16 (Jawaban E)