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January 31, 2015

January 31, 2015

Posted by **Kim** on Wednesday, January 16, 2013 at 4:02am.

-Find the result when the largest 4 digit number, all of whose digits are different, is subtracted from the smallest 5-digits number, all of whose digits are different .

- MATH PROBLEM -
**bobpursley**, Wednesday, January 16, 2013 at 9:18amfirst: what is the difference in 5h48'49.7" and 6hr?

answer: 11'10.3" check that. In four years, it is four times that.

second. smallest 5 digit number dealing with digits 0,1,2,3,4, and leading digit not zero: 10234

largest 4 digit number: 9876

- MATH PROBLEM -
**Reiny**, Wednesday, January 16, 2013 at 9:31am5 hrs, 48 min, 49.7 sec

= 5/24 + 48/(24x60) + 49.7/(24x60x60)

= .2422442 of a day error

in 4 years that would be .9689676

so when we add a day we have a difference of

1 - .9689676 = .0310324 of a day off every 4 years

which is equal to 44 minutes and 41.2 seconds

BTW, the current rule is this:

If the year is divisible by 4, then you have a leap year UNLESS, the year was a century whose first 2 digits were not divisible by 4, then you did not have a leap year, otherwise the century would also be a leap year

Thus in 1900 we did not have a leap year

but in 2000 we did.

There is something called "Zeller's Congruence"

http://en.wikipedia.org/wiki/Zeller's_congruence

which uses the above rules to calculate what day of the week any particular date is. I used to assign my computer science class to make up a program than has as input the date of your birthday, and it was to tell you if that was a Monday, Tuesday, etc.

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