Q 1639191912.     The average of m numbers is `n^4` and the. average of
`n` numbers is `m^4` .The average of `(m +n)` numbers is

CDS 2015 Paper-2
A

`mn`

B

`m^2+n^2`

C

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

D

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

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