Here’s how it works:
We’ve chosen a rule that some sequences of three numbers obey — and some do not. Your job is to guess what the rule is.
We’ll start by telling you that the sequence 2, 4, 8 obeys the rule:
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. You can test as many sequences as you want.