Multiple choice general knowledge math & puzzles

How many integral solutions (x,y) does the equation x^y = xy have?

  1. 1

  2. 2

  3. 3

  4. 4

  5. More than 4

Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The equation x^y = xy has several integral solutions including (1,1), (2,2), (1,0) is undefined, but also negative integers and specific pairs like (2,4) and (4,2). Because there are more than 4 valid pairs, 'More than 4' is the correct choice.