Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
All your base are belong to us
Sum all integers from 1 to 2^n
Is this triangle right-angled?
Matlab Basics - Rounding II
Selecting books on MATLAB for experts and beginners (blindfolded)
Calories in a slice of pizza?
How many jokers?
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