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Going from 3 to 7 is a jump of + 4, and going from 7 to 11 is a jump of + 4.

Therefore we know that the start of the nth term is going to be 4n.


So...when n = 1, 1 x 4 = 4, but we know from the sequence that when n = 1 the answer is 3, so we simply take 1 off the end to make...


4n - 1

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15y ago

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