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b. 122, 115
Caranya : a. setiap suku ditambah 8
b. setiap suku dikurangi 7
Semoga membantu ya :)
b=11-3=8
un=a+{n-1}b
3+{5}8
43
b.a=150
b=143-150=-7
un=a+{n-1}b
150+{5}-7
115