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