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a = 7
b = 7
Un = 294
Un = a + ( n - 1 ) b
294 = 7 + ( n - 1 ) 7
294 = 7 + 7n - 7
7n = 294
n = 42 bilangan
Bilangan mendekati 100 dan bisa dibagi 7 = 98
98 : 7 = 14
42 - 14 = 28 bilangan