Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Project Euler: Problem 6, Natural numbers, squares and sums.
Sum the Digits of a Number
02 - Vector Variables 5
04 - Scalar Equations 2
How to multiply?
Least common multiple of many numbers
Given a square and a circle, please decide whether the square covers more area.
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