Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Return elements unique to either input
Basics: 'Find the eigenvalues of given matrix
Sum the elements in either diagonal of a square matrix
Who invented zero?
Length of the hypotenuse
chance in percent for minimum K heads when a good coin is tossed N times?
How many jokers?
pressure to dB?
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