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Verified answer
A = 20U12 = 86
Sn = n/2(a + Un)
S12 = 12/2 (20 + 86)
S12 = 6 . 106
S12 = 636
jawabannya D
U₂₀ = 20 + (12 - 1)b
86 = 20 + 11b
66 = 11b
b = 6
Sn = 1/2 x n (a + Un)
S12 = 1/2 x 12 (20 + 86)
= 6 (106)
= 636
Jadi terdapat 636 kursi
semoga jelas dan membantu ya