2013 · Q43
If m and n are natural numbers, then the m-th root of n (m√n) is
Elementary MathematicsNumber System
- Aalways irrational
- Birrational unless n is the m-th power of an integer
- Cirrational unless m is the n-th power of an integer
- Dirrational unless m and n are co-prime
Explanation
Standard: rational iff n is perfect m-th power. Answer B.