Valid Username Regular Expression

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    I am getting 0.39583. These are all the possible combinations I am getting. 10 3 2 9 8 7 | 10 3 4 11 18 17 16 9 8 7 |10 17 16 9 8 7 10 17 18 11 4 3 2 9 8 7 | 10 9 8 7 |10 11 4 3 2 9 8 7 10 11 18 17 16 9 8 7

    Total 7 combinations, I calculated each one and I am getting 0.3958333. 10 is the statring position A. it is coordinate[1,4], so number of each position is ((i+1)*m+j). Please help me as I am also not getting the answer