Quantitative Aptitude Average

The average of n numbers is m3 and the average of m numbers is n3. What is thrice of the average of all numbers?

1
3(m2 + n2)/(m + n)
2
mn (m2 + n2)/(m + n)
3
3mn (m2 + n2)/(m + n)
4
3mn (m2 - n2)/(m - n)

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