Column 1
10 numbers to choose from, 5 spots.
10*9*8*7*6
Column 2
10 numbers to choose from, 5 spots.
10*9*8*7*6
Column 3
10 numbers to choose from, 4 spots.
10*9*8*7
Column 4
10 numbers to choose from, 5 spots.
10*9*8*7*6
Column 5
10 numbers to choose from, 5 spots.
10*9*8*7*6
Now multiply everything together. :))
=^._.^=