mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

24 December

The expression \((3x-1)^2\) can be expanded to give \(9x^2-6x+1\). The sum of the coefficients in this expansion is \(9-6+1=4\).
What is the sum of the coefficients in the expansion of \((3x-1)^7\)?

Show answer

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

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

Archive

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