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u9=a+8b=21
u5=a+4b=13
__________-
4b=8
b=2
a=5
B. Suku kesepuluh
u10=a+9b
u10=5+9.2
u10=23
C. Jumlah sebelas suku pertama
S11=1/2.11(2.5+(11-1)2
S11=5,5(10+10.2)
S11=5,5 x 30
S11=165