It's an old Chinese proverb found in many books of quotations.
An analog clock is correct twice a day (AM and PM display the same times). A military clock (0000 to 2400 hours) is only correct once.
Twice. Once in the am, once in the pm.
twice if you're looking for exact right angles
Twice.
Twice in a 24 hour cycle at 3:00.
a broken clock is right at least twice a day
The phrase "even a blind squirrel is right twice a day" is a combination of the phrases "even a broken clock is right twice a day". Both phrases mean that sometimes you can do something right even by doing nothing.
Twice a day.
An analog clock is correct twice a day (AM and PM display the same times). A military clock (0000 to 2400 hours) is only correct once.
That would depend on what kind of clock, and how "broken" it is. For example, a broken LCD digital clock could have a bad power switch and might be entirely blank - so it would NEVER be 'right". There's an old saying that "a STOPPED clock is right twice a day" - which assumes that the clock is analog, and that the hands are stopped. It could be "broken" by being too fast or two slow, in which case it might be correct only a few times per month.
Twice. Once in the am, once in the pm.
The first clock is right twice per day. The other wont be right for years. (However, neither clock could be said to be 'efficient!'.)
twice if you're looking for exact right angles
Twice.
The red clock, it's accurate twice a day since the hands never move, while the blue clock is never accurate.
Twice in a 24 hour cycle at 3:00.
No. Even a broken clock shows the correct time twice a day. (Unless it's one of those digital clocks that show a 24 hour day... ;-)