1. The problem is to arrange numbers so that the product of numbers on each line is the same. 2. This is a problem of equal products, often solved by ensuring the product of numbers in each group or line is constant. 3. The key formula is the product rule: for lines $L_1, L_2, \ldots, L_n$, we want $$\prod_{x \in L_1} x = \prod_{x \in L_2} x = \cdots = \prod_{x \in L_n} x.$$ 4. To solve, first find the total product of all numbers, then divide it equally among the lines. 5. For example, if you have numbers $a, b, c, d$ and want two lines with equal product, then $$a \times b = c \times d.$$ 6. You can rearrange or pair numbers to satisfy this equality. 7. Without specific numbers, the general approach is to factor numbers and group factors to balance products. 8. This ensures each line's product is the same, fulfilling the problem's requirement.