Please revise problem statement to indicate that summation is required, such as:
"the function avg_gain(odds,bets) should return the SUM of each bet's average gain (averaged for each possible outcome)"
It is not obvious from the example.
As stated by David, it is required to sum the averages after the calculation.
Check if sorted
Permute diagonal and antidiagonal
Sum the numbers on the main diagonal
Return area of square
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