# Pay attention to the time bar!

**Discrete Mathematics**Level 3

How many times does it happen during the match that the time bar is of the form:\(ab:ba\) for some positive integers \(a\) and \(b\) including \(0\)?

Note:

Assume there wasn't any extra time at the end of each half.

The match lasts from \( 00:00\) to \( 90:00\).