Well, let's assume March 1st is Sunday. April 1st is Wednesday, May 1st is Saturday, June 1st is Tuesday, July 1st is Thursday, August 1st is Friday, September 1st is Sunday. So, her birthday must be in September.
The wife's birthday, which falls on the same day of the week as her husband's birthday in March, must be in September. This is because when the calculations for days of the week are followed, September 1st aligns with March 1st being on a Monday. Therefore, the month of the wife's birthday is September.
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