Jump to content
BrainDen.com - Brain Teasers
  • 0


Guest
 Share

Question

24's a fun game that I play every so often.

Basically you get 4 random numbers, and you have to make them into 24. Here's the rules that I play by (you can change them however you want):

*You can use addition, subtraction, multiplication, division, logs, exponents, and parenthesis

*You have to use each of the numbers once

*In order to use logs or exponents, you need to use two of the numbers.

*You cannot take one to a power, and you cannot take the log of one.

For example, for 2 6 8 12, you can do:

12+8+6-2

(8*6)-(2*12)

(12-6)/2*8

6/(log of 8 base 2)*12

etc.

You can play 24 with a deck of cards, designating ace as one, jack eleven, queen twelve, king thirteen, and joker fourteen (you get used to the face cards being numbers after a while), and you can play with friends, with rules similar to War.

Keep in mind that there are plenty of combinations that cannot make 24 - but most can, and some are just very hard.

Here are some 24's for you guys to try solving...

the coolest one you'll ever see: 3 5 9 11

classic: 1 5 5 5

classic: 3 3 7 7

cool: 1 2 5 11

cool: 2 3 10 10 (find two ways)

3 of them I know off the top of my head, the other 2 I can solve (or one of my friends can if I get stumped)

Link to comment
Share on other sites

18 answers to this question

Recommended Posts

  • 0

Uh-uh, sorry, it's my way or da high-way, and I say no factorials! ^^

Also, if by "rt" you mean "square root," no can do. In order to make a square root, you'd need a 2

7 and 2 can make 49

7 and 49 can make 2

2 and 49 can make 7

However,

7 and 7 can't make 7

49 can't make 7

Link to comment
Share on other sites

  • 0

I used to play this all the time, with factorials allowed. After that got too easy, since 4! = 24, we decided to either take out the rule, or use a random number generator for every group of 4 cards.

@nemoyatpeace, I don't think you can use square roots...

With the given numbers and rules...

(5 - 1/5) * 5

(3 + 3/7) * 7

2 * (10 - 3) + 10...haven't found another way yet

Link to comment
Share on other sites

  • 0

I used to play this all the time, with factorials allowed. After that got too easy, since 4! = 24, we decided to either take out the rule, or use a random number generator for every group of 4 cards.

@nemoyatpeace, I don't think you can use square roots...

With the given numbers and rules...

(5 - 1/5) * 5

(3 + 3/7) * 7

2 * (10 - 3) + 10...haven't found another way yet

We use Ace = 1, Jack = 11, Queen = 12, King = 13, and Joker = 14.

14 always throws me

Those are all correct. The second way of doing 2,3,10,10 is really neat, imo. (Btw, I now remember all the solutions except the first one)

Link to comment
Share on other sites

  • 0

2[ (10 + 3 – log(10)]

3[10 – log(102)]

But, if you want a 2 for square root, then you might want a 10 to show my log is base 10?

So I'm hitting the highway for now. :blink:

Using log like that would require yet another 10, so yeah, that's not it

((11 - 5)^3) / 9 = 24

Ahhh, that's it! I like that one.

3 5 9 11

(11-5)^3 /9 = 216 / 9 = 24

1 5 5 5

(5 - 1/5) X 5 = 24

3 3 7 7

(3 + 3/7) X 7 = 24

1 2 5 11

(11^2 - 1)/5 = 24

Could you use a spoiler please? Thanks

All of those were correct! And you got the 1,2,5,11 one, which might be my favorite.

The only one that is left is the alternate (more interesting) version of 2,3,10,10

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Answer this question...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...