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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.

 May 28, 2022
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This is not difficult.

Draw a clock face and see when it is true.  The two hands must be at right angles to each other and since it is n o'clock the big hand must point to the 12.

 May 29, 2022

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