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U4 = a+b = 7
------------- -
2b = 8
b=4
a+b = 7
a+4=7
a=3
U11 = a+(n-1)b
U11 = 3+(10x4)
U11 = 43
U4 = a +b = 7 _
2b = 8
b=4
SUBTITUSIKAN
a+b = 7
a+4=7
a=3
mencari nilai U11
U11 = a+(n-1)b
= 3+(10-1)4
= 3+ (36)
= 39
jawabannya C