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 80 (Posted on 2015-12-19)
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=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

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