The electronic clock shows hours and minutes. How many times from 7 to 23 o’clock will they show four identical numbers?

The digital clock displays the time in digital form.

In the time range up to 10 o’clock, the clock cannot show the same digits, since it will display 0.

07 aces.

08 hours.

09 hours.

The same numbers will be displayed only at 11 o’clock and 22 o’clock.

Therefore, we get the following time:

11 hours 11 minutes and 22 hours 22 minutes.

Answer: The watch will show 4 identical digits only 2 times.