The calculation maps a random number R in range 0..255 to numbers 1..10 via R % 10 + 1 The problem is that 10 does not evenly divide 256, hence for large

The calculation maps a random number R in range 0..255 to numbers 1..10 via R % 10 + 1 The problem is that 10 does not evenly divide 256, hence for large R, the mapping will be incomplete. Specifically, 250 => 1 251 => 2 252 => 3 253 => 4 254 => 5 255 => 6 with no more random numbers available to yield results 7, 8, 9 and 10.