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5 December

You start at A and are allow to walk left, right, up or down along the grid. The grid continues forever in every direction. After you have walked thirteen units, how many different locations could you be in?

9 December

You start at A and are allowed to move either to the right or upwards.
How many different routes are there to get from A to B?

9 December

You start at A and are allowed to move either to the right or upwards.
How many different routes are there to get from A to B?
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