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a=0 b=3
Un= a + (n-1) b
= 0 + (n-1) 3
= 0 + 3n - 3
= 3n - 3.
b. 9,14,19,24,...
a=9 b=5
Un = a + (n-1) b
= 9 + (n-1) 5
= 9 + 5n - 5
= 5n + 4
c. 10,20,40,80,.. (geometri)
r = 20/10 = 2
Un = 10 x 2pangkat n-1