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1...2....3....4
3...7...11..15



7 - 3 = 4


11 - 7 = 4


15 - 11 = 4


(the start of the nth term is 4n)


4 x 1 = 4


(but the first term is 3, so...)


4 -1 = 3


nth term = 4n - 1

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Q: Find the nth term of the sequence 3 7 11 15?
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