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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.

 Feb 15, 2022
 #1
avatar+36433 
0

9    and  3   o'clock

 Feb 15, 2022
 #2
avatar+251 
+3

10 and 2 o'clock.

 Feb 15, 2022

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