Sunday Afternoon Maths XIII

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