mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2020

24 December

There are six ways to put two tokens in a 3 by 3 grid so that the diagonal from the top left to the bottom right is a line of symmetry:
Today's number is the number of ways of placing two tokens in a 29 by 29 grid so that the diagonal from the top left to the bottom right is a line of symmetry.

Show answer

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021

Advent calendar 2020


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2024