Filter 1's 2's and 3's in a Given set of combinations

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1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
1,2,3
In above number with 3 row and 15 columns,15 selections are must,how many combinations are generated,and filter no of 1′s 2′s and 3′s.
so are you suggest me for any solutions or any formula this combinations based.