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1. If matrix A = [[5, 6, 7], [8, 9, 10]] and A + B = 0, then find matrix B.
2. If A = {1, 2, 3, 4, 5} and B = {3, 4, 5, 6, 7}, find A U B.
3. In how many ways can 52 cards be distributed to four players with 13 cards each?