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a = 20
b = 2
Yang diminta adalah baris ke-25 (U₂₅)
Maka,
U₂₅ = a+(25-1)b
U₂₅ = a+24b
U₂₅ = 20+24(2)
U₂₅ = 20 + 48
U₂₅ = 68 kursi.
b = 2
Un = U1 + (n-1) b
U25 = 20 + 24 (2)
= 20 + 48
= 68