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