Line, plane, two points, three points???
I think you should put some order in your mind (and in description also) ... :)
Getting the absolute index from a matrix
Longest run of consecutive numbers
Set some matrix elements to zero
Generate a random matrix A of (1,-1)
Add two numbers
Convert from Base 10 to base 5
Find number of days
Find nearest prime number less than input number
Calculate the area of a triangle between three points
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