The average of p numbers is pq5 and the average of q numbers is qp5. Then the average of (p + q) numbers is:

1
p2q2 (p + q - pq)
2
p2q2(p2 + q2 + pq)
3
pq(p2 + q2 - pq)
4
p2q2(p2 + q2 - pq)

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