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1, 3, 5, 7, 9, ...
a = 1
b = 3 - 1 = 2
Un = a + (n - 1)b
= 1 + 2(n - 1)
= 2n - 1
Contoh dalam deret Geometri:
1, 2, 4, 8, 16, ...
a = 1
r = 2/1 = 2
Un = ar^(n - 1)
= 1.2^(n - 1)
= 2^(n - 1)
^ = pangkat