Write a function that gives the mean digit (round towards nearest integer) of an input and positive number. For example:
x = 264 --> y = 4
x = 128 --> y = 4
Test Suite problem #4 has an incorrect value.
Test suite #4 is incorrect
Flip the main diagonal of a matrix
Remove the two elements next to NaN value
Count up then down
Divisible by 10
Ratio between sum of primes and sum of factors
Say type of roots in quadratic equation
Approximate the inverse tangent by power series
Alternate list of elements
Sum of a geometric series
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