Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Colon operator of two vectors
Given area find sides
Return area of square
Sum of diagonals elements of a matrix
Find out sum of all elements of given Matrix
chance in percent for minimum K heads when a good coin is tossed N times?
letter yes yes & letter no no
Distance walked 1D
Person of interest?
Predicting life and death of a memory-less light bulb
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