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a = 5
b = 11-5 = 6
Un = a+(n-1)b
= 5 + ( n -1) 6
= 5 +6n -6
= 6n - 1
jawabn soal B
a = 13
b = 19-13 = 6
Un = 13+(n-1)b
= 13+ ( n -1) 6
= 13 +6n -6
= 6n + 7