IBPS Clerk Prelims Model Paper 5

Here, the series has two alternating series. In the first series (7, 10, 13…), the numbers are increasing by 3. Hence, the next number will be 13 + 3 = 16.
In the second series (6, 8, 10, …), the numbers are increasing by 2. Hence, the next number will be 10 + 2 = 12.