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There are four authors A, B, C and D. A ...

There are four authors A, B, C and D. A and C jointly wrote 3 books. A and D jointly wrote 4 books. B and C jointly wrote 4 books, B and D jointly wrote 3 books. The probability of the number of ways of selecting 6 books out of the 14 books, so that the selected ones have equal contribution by all the four authors is

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