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The pattern between these numbers seems to be that they are incrementing by five each time. (9 - 4 = 5, 14 - 9 = 5, etc.) Also, the series starts at four.

So the formula to find the nth term for this series would be

5(n-1) + 4

For the first in the series to be four, the n being multiplied by the five must be zero, so that is why there is the minus one.

Testing the formula:

5(3-1) + 4 = 14 correct

5(5-1) + 4 = 24 correct

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15y ago

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