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Consult everybody an oracle problem of permutation and combination

Time:09-22

Question is this: now want to achieve from under A pile of data, A random sample of four categories: A, B, C, D make the last val A total of 960
Data table has two columns in A
The type, val
D 11
9 C
30 D
D 20
21 C
14 C
17 B
A 16
9 B
19 B
13 D
A 8
9 B
30 B
A 12
A 6
30 B
13 B
14 C
B 16
5 B
30 C
30 B
15 D
30 B
30 B
9 B
13 B
D 57
15 D
23 D
10 B
13 D
17 B
15 B
A 15
16 C
13 D
19 D
5 B
8 C
17 B
A 6
5 B
D 12
17 B
11 C
17 B
A 24
11 B
19 B
A 9
15 D
28 C
D 32
D 10
15 C
A 12
19 D
30 B
B 16
13 D
11 B
D 30
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