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8 = a + 2b 149 = a + 49b
a = 8 - 2b =====================> 149 = (8 - 2b) + 49b
141 = 47b
3 = b
a = 8 - 2b
a = 8 - 2(3)
a = 2
Un = a + (n-1)b
U100 = 2 + (100-1)3
U100 = 2 + 297
U100 = 299
Beda = 3
Suku ke 100 = 299