Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Get the area codes from a list of phone numbers
How to find the position of an element in a vector without using the find function
random picture with random colours
Angle between two vectors
Duplicate a character
Calories in a slice of pizza?
Volume of this donut
How many jokers?
radius of a spherical planet
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