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Using its own digits (Posted on 2018-05-31) Difficulty: 3 of 5
a.What two-digit number equals the product of units' digit by the factorial of tens' digit?
b. What if a non-decimal system (base below ten) were allowed?

See The Solution Submitted by Ady TZIDON    
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Hints/Tips re: beyond base 10, analytical solution....TBC | Comment 3 of 9 |
(In reply to beyond base 10, analytical solution by Daniel)

You have to pay attention that  both x and y are less than b and b<10. 

Please continue and find out how many bases qualify.

  Posted by Ady TZIDON on 2018-06-01 04:14:13
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