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**...**

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*Edited on ***December 19, 2015, 4:41 pm**