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U8 = 23
U30 = ?
(cara cepat)
b = 23 - 14 / 8 - 5
b = 9 / 3 = 3
(ambil salah satu persamaan lalu substitusi)
U5 = a + (5 - 1) x 3
14 = a + 4 x 3
14 = a + 12
a = 14 - 12 = 2
U30 = a + (n - 1) b
U30 = 2 + (30 - 1) x 3
U30 = 2 + 29 x 3
u30 = 2 + 87 = 89
( 23 - 14 ) : ( 8 - 5 ) = 3
Awal :
14 = a + 4b
14 = a + 12
a = 2
Suku ke 30 :
U₃₀ = a + 29b
= 2 + 29 × 3
= 89