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a = 5
b = 9-5
= 4
rumus barisan aritmatika
Un = a + (n-1)b
U100 = 5 + (100-1) 4
= 5 + (99)4
= 5 + 396
= 401
jawabnnya 401
b => 9-5 = 4 {setiap barisan bertambah 4}
mencari U10 : ?