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U₂ = a
U₃ = a + 2
U₁ + U₂ + U₃ = 78
a-2 + a + a+2 = 78
3a = 78
a = 78/3
a = 26
U₁ = a-2
= 26 - 2
= 24
U₁ = a
= 26
U₃ = a+2 = 26 + 2
= 28
Suku yang dimaksud adalah 24, 26, 28
Jadi terkecil adalah 24