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Mathematics
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Lourrran's user avatar
Lourrran
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14
If you write all the whole numbers from 1 to 9999 but skip every number that contains the digit 4. How many times would you have to write the digit 1?
Oct 12, 2022
10
Cuba 2003 Coloring Problem
Oct 19, 2024
9
Possibility of arranging $1$ and $-1$ in a grid such that the sum of the products is $0$
Jan 31, 2023
8
Twin circles (arranging integers around a circle)
Feb 24
6
Sets of fractions with fixed sum of numerator and denominator
Feb 12
5
Without Calculator find $\left\lfloor 2 \cos \left(50^{\circ}\right)+\sqrt{3}\right\rfloor$
Feb 6, 2023
4
Rolling a unit cube on a chessboard
Feb 27
4
Can we use the proof of the weak Goldbach conjecture to also prove the strong Goldbach conjecture?
Oct 8, 2023
4
Prove that $7 | (3^{2n} − 2^{n} )$ for every nonnegative integer $n$.
Nov 2, 2022
3
Dice game with token system
Sep 25, 2024