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U6=17=a+5b ( dieleminasi)
-6=-2b
b=3
a+3b = 11
a = 11 - (3 x 3)
a = 11 - 9 = 2
U9 +U20
a+8b +a+19b = 2a +27b = (2x2) + (27 x 3)= 4 + 81 = 85
maaf kalau ada salahbdalam perhitungan
U6 = 17
S9? S20?
U4 = a+3b = 11
U6 = a+5b = 17 _
-2b = -6
b = 3
a+3b = 11
a+3(3) =11
9a = 11 ⇒ a = 2
S9 = 9÷2 {2a+(n-1)b)} S20 = 20÷2 {2a+(n-1)b}
= 4,5 {2(2)+(9-1)3} = 10 {2(2)+(20-1)3}
= 4,5 {4+(8)3} = 10 {4+(19)3}
= 4,5 {4+24) = 10 {4+57)
= 4,5 {28} = 10 {61}
S9 = 126 S20 = 610