Math problem 1, 3, 7, 13, 2 1 What are the last two numbers?
3 1,43
Because the difference between 1 and 3 is 2, the difference between 3 and 7 is 4, the difference between 7 and 13 is 6, and so on, 2, 4, 6, 8, 10, 12, and the following number is 21+.