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U₁ = a = 3
b = 7 - 3 = 4
U₁₅ = a + (n - 1) x b
= 3 + (15 - 1) x 4
= 3 + 56
= 59
semoga jelas dan membantu ya
B. beda = 4
C. suku ke 15 = 59