List questions from calendar-computations

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List Question

Distribution of days in a week on Christmas

How often will the same date be on the same day of the week?

birthday problem - expected number of collisions

Formula for occurrence of leap years in the Jewish calendar

How to calculate Anniversary Billing for Uneven time frames?

Prove that every year has at least one Friday the 13th

Math Riddle Involving Birthdays

Hindu calendar (lunar) to Gregorian calendar

Jack's birthday riddle

Modular Arithmetic Calendars

Periodicity of calendar

In a certain year, January had exactly $4$ Mondays and $4$ Fridays. What was the day on $2^{\text{nd}}$ October the previous year?

How many odd days are there in 1600 years ? I calculated it but I guess the result is wrong?

Is there any fast way to get the number of a certain day in a week

Prime number based calendar: how to calculate intermediate values?

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