When mystery is applied to 3 and 5: results are 8 , 40320
When mystery is applied to 4 and 6: results are 3628800 , 10
When mystery is applied to 5 and 7: results are 479001600 , 12
When mystery is applied to 3 and 3: results are 6 , 720
When mystery is applied to 7 and 3: results are 3628800 , 10