Answer in 5 . 4 . 3 . 2 . 1 .....

[Uncwilly]

Originally Posted by slandrum

It says to use the digits in order, not the numbers 5,4,3,2,1. My answer above uses the digits in order along with + and -. It clearly fits within the stated instructions. Problems of this sort are often stated like this so that in order to answer them, you have to let go of an automatic assumption.

My answer above is not the only answer either. 5 * 4 * 3 - 21 also works.

And in the answers at the original source they said no answer for that number was found. There your understanding of the rules does not comport with what the original maker of the puzzle said. Groupings required parenthesis in their rules.

[lavalamp]

I haven't see 180 yet:
5*4*3*(2+1)