Answer: What Comes Next? #382

The answer is C: 48.

The rule

Add 3, then add 10, then 3, then 10, and so on. The pattern of adding takes turns.

The pattern as Python code

Here is a tiny Python program that follows the same rule. Type it into IDLE and run it to print the whole pattern, including the answer.

adds = [3, 10]
number = 9
for step in range(7):
    print(number)
    number = number + adds[step % 2]

When you run it, Python prints:

9
12
22
25
35
38
48