Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Remove the air bubbles
Create a cell array out of a struct
Find the "ordinary" or Euclidean distance between A and Z
Make a random, non-repeating vector.
Maximum value in a matrix
radius of a spherical planet
Acidity of vinegar and salts
Check if any duplicates in your data
letter yes yes & letter no no
Acid and water
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