Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Make one big string out of two smaller strings
Compute a dot product of two vectors x and y
Switch matrix to a column vector
Test Problem; Create a 5x5 array containing all ones
Generate one sample of uniform random numbers between -pi and +pi
Basic electricity in a dry situation
Acid and water
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