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More ways to get Braingle...

5-digit Numbers

Math brain teasers require computations to solve.

 

Puzzle ID:#11908
Fun:*** (2.63)
Difficulty:*** (2.67)
Category:Math
Submitted By:Mhalun***

 

 

 



How many 5-digit numbers are there that do not contain the numbers 3 and 5, and are multiples of 4?
(It cannot start with 0, ie. 01234 is not a 5 digit number)

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Comments

bumbles2003
Apr 24, 2003

yeah pretty good work
Mhalun*
Apr 24, 2003

Thnks! Please give me more suggestions!!!!
jimbo*au*
Apr 25, 2003

Nicely explained. I rushed in and got 7*8*8*20 by halving the number of numbers dividible by 2. I had a suspicion that it was wrong so you've set me straight.
jimrcook
Apr 28, 2003

In fact, if you prohibit any two odd digits (instead of 3 and 5), you still get 9408. But, which two digits would you prohibit to have the least number of solutions -- 4032? Thanks for the fun puzzle.
smart432890
Apr 29, 2003

hi
EverquestBoy
May 21, 2003

Dude nice one i couldnt figure that out if my life depende on it but it was sorda fun to also see a difrent teaser for once.
jacintan*
Jun 13, 2003

I don't quite realise how to work that out yet.
Not the kind of thing you learn in year four



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