teachMathematics: OXO

"A great problem that instantly engages and gives rise to lots of algebraic sequences - terrific for linking sequences to real situations" Imagine a 3D game of Noughts and Crosses, Tic Tac Toe or OXO for short! How many ways are there to get three in a row? How can you count them systematically, making sure you don"t count any twice or leave any out? What about a bigger playing cube? What about a bigger playing...

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