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The number of ways of creating a qualifying number is {25 \choose 9}=2042975 as you found. hotel oyo 99 banjarmasin The reasoning is that you can increment 9 times - possibly before and after the 16 digits - from 0 . lucky slot 99 wap Choosing the vertices of a regular hexagon, how many ways are there to form four triangles such that any two triangles share exactly one vertex?