1. The problem is unclear in its current form, but it seems you may be asking if it is possible to do something with the numbers 3, 5, 15, and 2. 2. To clarify, let's consider some common questions involving these numbers: can you form a particular sum, product, or some relation? 3. For example, if the question is whether 15 can be obtained by multiplying 3, 5, and 2 in any combination, note that $3 \times 5 = 15$. 4. Also, $15$ is divisible by $3$ and $5$, so you can relate these numbers multiplicatively. 5. However, if the question is to express one number as a linear combination of others or some other operation, please provide more details. Please provide more context or specifics to assist you properly.