So, F58 is the answer. The sequences in each of the puzzles below are encoded similarly—with letters of the English alphabet and numbers in patterned combinations.

Row 2: 4, 5, 6 Row 3: 7, 8, 9 The bottom row contains three numbers, written in red: 27, 38, and a question mark. The challenge At first glance, it looks like a straightforward number sequence puzzle.

We’ll start by telling you that the sequence 2, 4, 8 obeys the rule: Now it’s your turn. Enter a number sequence in the boxes below, and we’ll tell you whether it satisfies the rule or not.