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AMO 2027 Grades 2-3 SET 17 - Self-study Question 10

AMO · AMO 2027 Grades 2-3 SET 17 - Self-study

Question 10

Consider the following pattern:

0 → 1

8 → 2

1 → 0

368 → 3

6 → 1

1008 → 4

What is 2021 → ?

Self-study visual rule (editorial): count enclosed holes in the displayed digit shapes. Use 0 and 6 with one enclosed hole, 8 with two, and 1, 2 and 3 with none.