To see what equation gives us the sequence, let's first try to find a pattern. 6 to 12 can be: x + 6, 2x, 3x -6. 12 to 24 can be: x + 12, 2x, 3x -12. 24 to 48 can be: x + 24, 2x, 3x - 24. Let's see if we can find a common pattern. 2x is a common pattern. Your equation is : n = 2x. I hope this helps!