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u7=88
beda=38 - 18 20
----------- =------ = 5
7-3 4
mencari suku awal kita coba u3
u3=a+(n-1)b
18=a+ (3-1)5
18 =a+10
a=18-10
8
masukkan suku ke 24
u24 = a+(n-1)b
8+(24-1)5
8+115
123