Find all integers n such that when the clock strikes n o'clock, the acute angle between the hour and minute hands is 90 degrees. Enter your answer as a comma-separated list.
Find all integers n such that when the clock strikes n o'clock, the acute angle between the hour and minute hands is 90 degrees.
On a 12-hour clockface, at the top of the hour, the angle is 90o at 3:00 and 9:00. BTW, 90o is not an acute angle.
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