# math

a=6,9,12,15,18,…
Find the closed form: an=

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2. 👎 0
3. 👁 74
1. looks like an arithmetic sequence,
with a = 6, d = 3

an = a + (n-1)d
= 6 + 3(n-1)
= 3n + 3

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2. 👎 0

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