Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Times 2 - START HERE
vectorization in N
What is the distance from point P(x,y) to the line Ax + By + C = 0?
length of a vector
Multiply to the limit?
Given n, create n random numbers such that their standard deviation is also n.
Predicting life and death of a memory-less light bulb
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