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Un = a + (n - 1).b
Un = 10 + (n - 1). - 3
Un = 10 - 3n + 3
Un = 13 - 3n
b= 7 - 10 = -3
Rumus ke-n :
un = a + ( n - 1)b
= 10 + ( n - 1) -3
= 10 + (-3n) + 3
= 10 - 3n + 3
= 13 - 3n