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

(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