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Answer:

23 times. Last second of every hour.

On 24 hours, a digital clock displaying hours, minutes, and seconds all six digits change 23 times simultaneously.

Change of digits:

The digits representing the seconds on the clock change for every second.

The minute digits change for each minute that is for every 60 seconds.

Similarly, the digits representing the hours on the clock change every 60 minutes.

This means that for all the six digits to change simultaneously, the last second must be such that it completes a minute, and the last minute should be such that it completes an hour.

This means that at the end of every hour, all the six digits change.

Which will happen 23 times for a 24 hours clock.

Learn more about digital clock:

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