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= (30 - 18) ÷ (10 - 6)
= 12 ÷ 4
= 3
Un = a + (n - 1)b
18 = a + (6 - 1) 3
18 = a + 15
a = 18 = 15
a = 3
S 16
= (n ÷ 2) × (2a + (n - 1)b)
= (16 ÷ 2)× (2.3 + (16 - 1)3)
= 8 × (6 + 45)
= 8 × 51
= 408