Answer: What Comes Next? #240

The answer is C: 13.

The rule

Take away 2 each time.

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.

number = 25
for step in range(7):
    print(number)
    number = number - 2

When you run it, Python prints:

25
23
21
19
17
15
13