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RE: Brainsteem #9 Prize Maths Puzzle [Win 40% and 10% in SBD]
4 number from 1-9 sum up to 17:
1259 1268 1349 1358 1367 1457 2348 2357 2467 (9 combinations)
or 4 number from 1-9 sum to 28: 9874 9865 (2 combinations)
The probability= [11* (4!*5!)]/9! =11/126
so m+n= 137