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How many permutations of the numbers 1, 2, 3, 4, 5, 6 and 7 are there in which: (a) 1 and 2 are adjacent and

How many permutations of the numbers 1, 2, 3, 4, 5, 6 and 7 are there in which:

(a) 1 and 2 are adjacent and 3 and 4 are adjacent?

(b) 1 and 2 are adjacent and 3 and 4 are not adjacent?

permutations grade 12 data management

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