Answer: What Comes Next? #367

The answer is D: 27.

The rule

Add 2, then add 6, then 2, then 6, 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 = [2, 6]
number = 3
for step in range(7):
    print(number)
    number = number + adds[step % 2]

When you run it, Python prints:

3
5
11
13
19
21
27