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If the average of m numbers is n2 and that of n numbers is m2 , then the average of (m + n) numbers is?
  1. m - n
  2. m + n
  3. m/n
  4. mn
Explanation

Sum of m numbers = mn^2

Sum of n numbers = nm^2

∴ Average of (m + n) numbers

= mn(m+n)/(m+n)

= mn

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