Indicate a general rule for the nth term of this sequence. 12a, 15a, 18a, 21a, 24a, . . .
1 answer:
It is an arithmetic progression. Note the general rule for AP sequences:
a(n) = a(1) + (n - 1)d
a(1) = 12a (first term)
d = 3a (common difference)
General rule: a(n) = 12a + (n - 1)*3a
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