Question

1. The flea market is open every 4th Saturday.
2. The flea market is open every four Saturdays.

3. He takes a shower every second day.
4. He takes a shower every two days.
...........
#3 and #4 are the same. What about #1 and #2? Are both the same as well?

Answer 1

2 is not as clear as 1.