If there are four Sundays in March of a certain year, what day is October 1?

If there are four Sundays in March of a certain year, what day is October 1?

The first Sunday is x, the fourth Sunday is x + 21 days, March 31 days, and the remainder is 10-x. if x is less than 4 and the remainder is greater than 7, there must be one more Sunday. That is, March 1, March 2, March 3 can not be a Sunday. March 1 is 30 + 30 + 31 + 30 + 31 + 31 + 30 + 1 = 245 days (other 244 and 243) 245 divided by 7

If October is just right and there are four Sundays, then October 1 can't be the day of the week

It can't be Friday, Saturday or Sunday

There are five Saturdays and four Sundays in October of a certain year. October 1 of this year is ()
A. Monday B. Tuesday C. Wednesday D. Thursday

October has 31 days, and 31 = 4 × 7 + 3, so this month has 4 weeks and 3 days. We can use the hypothetical method to calculate the first Saturday of this month: (1) if October 1 is a Saturday, then October 2, 9, 16, 23 and 30 are all Sundays, and there are 5 Sundays, which is not consistent with the meaning of the title; using the same method, we can calculate that October 2 is not a Saturday (2) If October 3 is a Saturday, then October 4, 11, 18 and 25 are Sundays, which are exactly four Sundays. If you push back, you can know that October 1 is a Thursday

March 6, 2002 is Wednesday. What day is March 6, 2003?

March 6, 2003 is Thursday