Type the missing digit:
5 | , | 7 | 7 | ||
| − | 3 | , | 5 | 2 | 0 |
2 | , | 2 | 1 | 7 |
ref_doc_title.
Jumping to level 1 of 1
Excellent!
Now entering the Challenge Zone—are you ready?
5 | , | 7 | 7 | ||
| − | 3 | , | 5 | 2 | 0 |
2 | , | 2 | 1 | 7 |
Now entering the Challenge Zone—are you ready?