50, 52, 56, 62, 70, 80, 92
Let's start left to right
50 + 2 = 52
52 + 4 = 56
56 + 6 = 62
62 + 8 = 70
70 + 10 = 80
80 + 12 = 92
As you can see, the numbers are being added by 2 each time plus 2 more every time the number's place gets higher. For example, 52 is the 2nd number, and it's being added by 4. 62 is the 4th number, and it's being added by 8.
