Number connections

[bonanova]

What is the connection among the following?

4/4, 6/6, 8/8, 10/10, 12/12, 5/9, 9/5, 7/11, and 11/7?

[akaslickster]

they are all connected by not existing on a standard measuring cup?

[bonanova]

they are all connected by not existing on a standard measuring cup?

Ahhh... you can do better!

[akaslickster]

all can be reduced to 1 or 2

[bonanova]

all can be reduced to 1 or 2

It's a much tighter connection than that.

[kingofpain]

Looks like it is a 'reversible' relationship between the 'numerator' and the 'denominator'

i.e. if f(n) = d then f(d) = n

obviously, it is not a fraction thing since 4/4,12/12 etc... are specifically listed

so

4<->4

5<->9

6<->6

7<->11

8<->8

9<->5

10<->10

11<->7

12<->12

Even numbers always map to themselves and odd numbers do not (They go fwd or back 4)

Hmmm... curious!!

Cheers!

--

Vig

[Guest]

Specific gravity of the ten planets if you include pluto and X

[Guest]

dates using both the british and american systems eg July 5th British system :5/7 american system: 7/5

Edited June 6, 2008 by punkAlarm

[Guest]

They are all the same day...i.e in 2008 they are all fridays

this obviously only works on a leap year

edit to show answer as a spoiler ops this is my first post

Edited June 6, 2008 by Karl Mac

[Guest]

edit to show answer as a spoiler ops this is my first post

They are all the same day...i.e in 2008 they are all fridays

this obviously only works on a leap year

I'm going to assume your answer is right, but here's my possibility:

All are dates that would still be dates if the day/month were reversed. (5/9 and 9/5 are both valid dates).

I kinda think the same day of the week thing is the right one, though.

[Guest]

They are all the same day...i.e in 2008 they are all fridays

this obviously only works on a leap year

I recognised the numbers from the Doomsday method for figuring out days of the week.

[akaslickster]

I recognised the numbers from the Doomsday method for figuring out days of the week.

I'll agree but I never use a calender. My cell tells me what day it is.

[bonanova]

They are all the same day...i.e in 2008 they are all fridays

this obviously only works on a leap year this is my first post

edit to show answer as a spoiler ops

Hi Karl Mac, and welcome to BrainDen - you have it.

But leap year is irrelevant.

[Guest]

Hi Karl Mac, and welcome to BrainDen - you have it.

But leap year is irrelevant.

ah yes you are right...all dates are after the Feburary.