**What is the probability that the forth business day of the month is Thursday?(forget about the holidays on weekdays)**

This is like asking what is the probability that the first day of the month is Sat, Sun, or Monday. So the answer is 3/7. Many people including me will make the mistake to give answer of 1/5. Notice Monday – Friday are not symmetric because of the non-business day Sat and Sunday.

**What is the probability that the forth business day of the month is Monday?**

1/7

**What is the probability that the forth business day of the month is Tuesday?**

1/7

**What is the probability that the forth business day of the month is Wednesday?**

1/7

**What is the probability that the forth business day of the month is Friday?**

1/7

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