Answer: What Comes Next? #225

The answer is A: yellow triangle.

The rule

The pattern repeats every 4 things: red triangle, yellow triangle, purple triangle, yellow triangle. Then it starts again from the beginning.

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.

pattern = ["red triangle", "yellow triangle", "purple triangle", "yellow triangle"]
for position in range(10):
    print(position + 1, pattern[position % len(pattern)])

When you run it, Python prints:

1 red triangle
2 yellow triangle
3 purple triangle
4 yellow triangle
5 red triangle
6 yellow triangle
7 purple triangle
8 yellow triangle
9 red triangle
10 yellow triangle