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