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U7 = a+6b = 22
U11 = a+10b = 34 _
-4b = -12
b = 3
a+6(3) = 22
a = 22-18
a = 4
Sn = n/2 (2a+(n-1)b)
S18 = 18/2 (2.4+17.3)
= 9 (8+51)
= 9.59
= 531
semoga membantu ya :)