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If October of a certain year has 5 Wednesdays, on what days of the week could Halloween fall? Note: Halloween = October 31

 May 19, 2021
 #1
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For this to occur either the  1st  2nd  or  3rd  must be a Wednesday

   which would make Halloween (the 31 st) be a   Friday   Thursday or Wednesday  respectively

 May 19, 2021
 #2
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The 1st, 2nd or 3rd of the month could be a Wednesday, giving 5 Wednesdays in the month. If the 1st is a Wednesday, then the 29th would also be a Wednesday. That would make the 31st a Friday. If the 2nd is a Wednesday, so is the 30th, so Hallowe’en would be on Thursday. If the 3rd is a Wednesday, so is the 31st.

 May 24, 2021

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