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
Return the largest number that is adjacent to a zero
Project Euler: Problem 10, Sum of Primes
Sum of first n terms of a harmonic progression
Given a 4x4 matrix, swap the two middle columns
Say type of roots in quadratic equation
Alternating 1´s and 0´s in a matrix
Sum of a geometric series
Check if is a square
Get the value 100
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