If the average of m numbers is n^(2) an...

If the average of m numbers is `n^(2)` and that of n numbers is `m^(2)` . Then find the average of ( m + n) numbers.

A

mn

B

`m^(2)+n^(2)`

C

`mn(m^(2)+n^(2))`

D

`mn(m^(2)+n^(2)-mn)`

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