El'endia Starman
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 12 How to prove $\left \lceil \frac{n}{m} \right \rceil = \left \lfloor \frac{n+m-1}{m} \right \rfloor$? 11 Show that from a group of seven people whose (integer) ages add up to 332 one can select three people with the total age at least 142. 7 Convert any number to positive. How? 6 Logic Puzzle of the age of three sons 5 Is “divisible by 15” the same as “divisible by 5 and divisible by 3”?

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 +5 Which is greater, $20 \uparrow\uparrow\uparrow\uparrow 20$ or $4 \uparrow\uparrow\uparrow\uparrow\uparrow 4$? +5 How can the trefoil knot be expressed in polar coordinates? +10 Using floor, ceiling, square root, and factorial functions to get integers +5 Is the non-existence of a general quintic formula related to the impossibility of constructing the geometric median for five points?

### Questions (33)

 24 Which is greater, $20 \uparrow\uparrow\uparrow\uparrow 20$ or $4 \uparrow\uparrow\uparrow\uparrow\uparrow 4$? 20 Using floor, ceiling, square root, and factorial functions to get integers 15 Primey Pascal's Triangle 9 Maximum number of cubes within a radius 9 Cube skeleton bindings

### Tags (63)

 28 combinatorics × 6 9 circle × 2 23 discrete-mathematics × 2 7 probability × 3 13 trigonometry × 4 7 calculus × 2 12 algebra-precalculus × 5 6 logic 10 divisibility × 2 6 puzzle

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