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You start a stamp collection with \(12\) stamps. Each month, you add \(4\) new stamps to your collection.
The number of stamps you have after \(n\) months is given by the formula:$$\begin{aligned}u_n &= \text{Initial number of stamps} + \text{Nbr months} \times \text{Stamps added per month} \\ &= 12 + n \times 4 \\ &= 12 + 4n \\ \end{aligned}$$where \(u_n\) is the number of stamps after \(n\) months. How many stamps will you have after \(15\) months?
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