find the explicit formula for 6, 2, -2

I don't know the explicit formula and I don't know if it's arithmetic or geometric
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6, 2, -2 has a common difference of 4: 6, 6-4, 6-4-4. The nth term is 6-4n, where n starts at 0. If n is to start at 1, the formula is 6-4(n-1)=6-4n+4=10-4n.

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It is for my math session because I am home schooled please help me!
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