Jawab:(a.) = (2.) 3+2+4+2+..(b.) = 165
Penjelasan dengan langkah-langkah:(a.) (1.) 6 - 3 = 3, 9 - 6 = 3 beda = 3(2.) 2- 3 = -1, 4-2 = 2, beda berbeda (geometri)(3.) 5-1 = 4, 9-5 = 4, beda = 4
(b.) a = 3b = 6-3 = 3n = 10 (10 suku)Sn = ⁿ/₂ × ((2×a) + (b×(n-1)))S₁₀ = ¹⁰/₂ × ((2×3) + (3×(10-1)))S₁₀ = 5 × (6 + (3×9))S₁₀ = 5 × (6 + 27)S₁₀ = 5 × 33S₁₀ = 165
(xcvi)