All about flooble | fun stuff | Get a free chatterbox | Free JavaScript | Avatars    
perplexus dot info

Home > Numbers
80 (Posted on 2015-12-19) Difficulty: 2 of 5
On my 80th birthday my guests were presented with several sets of 4-digit numbers and challenged to create the number 80 using some (or all) of the 4 digits, basic math. signs (+,-,*,/,^ ,concatenation and brackets).
Examples:
n=1268; answers 16+8^2 or 68+12
n=3024; answers 320/4 or 20*4 or 40*2

More (for you to solve):
0269
0246
0468
0579
0126
1234
1469
1579
1645
2359
5555
8249
9999

No Solution Yet Submitted by Ady TZIDON    
No Rating

Comments: ( Back to comment list | You must be logged in to post comments.)
re: computer solutions for all but 2359 | Comment 2 of 3 |
(In reply to computer solutions for all but 2359 by Charlie)

2359   .............  hmmm, nothing here

Absolutely right!

Red herring....

2359 is the only example where !(factorial) is a must:

80=5! * 2/3

Computer would never try "out of the box", a human might...

Edited on December 19, 2015, 4:41 pm
  Posted by Ady TZIDON on 2015-12-19 16:37:37

Please log in:
Login:
Password:
Remember me:
Sign up! | Forgot password


Search:
Search body:
Forums (0)
Newest Problems
Random Problem
FAQ | About This Site
Site Statistics
New Comments (1)
Unsolved Problems
Top Rated Problems
This month's top
Most Commented On

Chatterbox:
Copyright © 2002 - 2017 by Animus Pactum Consulting. All rights reserved. Privacy Information