That depends how you want to "combine" them: add, subtract, multiply, etc.
To combine two numbers, you can use various mathematical operations, such as addition, subtraction, multiplication, and division. Each operation can yield a different result; for example, if you combine the numbers 3 and 5, you can get 8 (addition), -2 (subtraction), 15 (multiplication), or 0.6 (division). Additionally, you can also consider concatenation as a way to combine numbers, resulting in 35 or 53 depending on the order. Thus, the total number of ways to combine two numbers depends on the operations and methods you choose.
The summands.
The LCM will be the product of the two numbers divided by 15.
3 and 15
They're 5 and 15.
x + y = 15 x - y = 7
The two numbers are 5 and 15. 5 + 15 = 20. 15 - 5 = 10.
15 + 1 = 16, and 15 - 1 = 14, so the two numbers are 15 and 1.
The product of the prime numbers 3 and 5 is 15.
12 and 3
3 & 15
3 and 12