Which expression is equivalent to (m^5n/pq^2)4

(m^5n/pq^2)4 can be expressed as (m^5)^4n^4/p^4(q^2)^4

= m^20n^4/p^4q^8

Therefore, the equivalent expression of (m^5n/pq^2)4 is m^20n^4/p^4q^8.