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

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

Archive

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