1
00:00:00,000 --> 00:00:06,356
Proof. One divided by b over c equals c over b.

2
00:00:34,150 --> 00:00:35,874
Problem A.

3
00:02:38,166 --> 00:02:39,962
Problem B.

4
00:03:12,350 --> 00:03:14,194
Problem C.