1st: Using each of the numbers (1,4,6)
once and any number of operations from the set (+, , *, /, concatenation, sqrt,
fact !, brackets) create number 31.
2nd: Same rules, same restrictions, integers (1,6,8)  create 57.
concatenate(6/sqrt(4),1) = 31
If the symbol  (two pipes) is used for concatenation, then ...
6/sqrt(4)  1 = 31
Edited on September 7, 2020, 1:21 pm

Posted by Larry
on 20200907 13:13:54 