It looks straightforward, but the careful step-by-step count is what prevents mistakes:
- 1 large outer circle
- 4 medium circles inside → total so far: 5
- Each medium has 2 small circles → 4 × 2 = 8
Add them up: 1 + 4 + 8 = 13
Final count:
- 1 large
- 4 medium
- 8 small
Total = 13 circles