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Shamoon713

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Shamoon713
How many different linear arrangements are there of the digits 1, 2, 3, 4, 5, 6 for which: (a) 5 and 6 are next to each other ? (b) 5 is before 6? (c) 3 is before 4 and 5 is before 6? (d) 3 and 4 are...

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