Without using any arithmetical symbols (+, -, *, /, or similar; other math symbols; decimal comma or periods; letters; even parentheses) or, in short, anything but the digits, build a number with the digits 1, 3, 5, 7 and 9, that is equal to a number built with the digits 2, 4, 6 and 8 (each digit used once and only once).

Note: This is not a trick. It was extracted from a book edited by Angela Dunn, a mathematician who gathered problems that appeared in many scientific periodical revues!

(In reply to A slight modification by Larry)

you say:  "...<2468> in some base n where n>8 is equal to a number in <13579> in some other base m where m>9."

NO CAN DO!  The 1st is always even , the 2d odd.

Posted by Ady TZIDON on 2016-10-16 14:29:05