mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2016

2 December

What is the maximum number of lines that can be formed by the intersection of 30 planes?

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2025

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022


List of all puzzles

Tags

combinatorics medians integers parabolas 2d shapes rugby triangles sets complex numbers products geometry chalkdust crossnumber numbers spheres matrices addition ave determinants floors percentages coordinates number bases grids star numbers fractions square numbers colouring cards prime factors games range triangle numbers coins perfect numbers area sum to infinity dominos median consecutive integers xor symmetry shape graphs probability odd numbers lines expansions decahedra neighbours balancing doubling ellipses squares digital clocks money factors pascal's triangle probabilty volume scales cubics the only crossnumber irreducible numbers tiling mean gerrymandering geometric means remainders crosswords elections differentiation 3d shapes folding tube maps hexagons quadratics factorials cryptic clues perimeter shapes palindromes sport multiplication binary time axes logic division pentagons quadrilaterals regular shapes albgebra planes unit fractions christmas dice geometric mean square roots means books even numbers powers square grids proportion digits chocolate consecutive numbers arrows sums partitions trigonometry multiplaction squares lists taxicab geometry advent rectangles cube numbers circles speed crossnumbers angles cryptic crossnumbers functions tournaments surds algebra menace multiples tangents integration prime numbers calculus wordplay averages dates indices sequences people maths clocks routes chess polygons dodecagons polynomials digital products

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2026