Mathematics

8 June, 02:30

How many different linear arrangements are there of the letters A, B, C, D, E, F for which

(a) A and B are next to each other?

(b) A is before B?

(c) A is before B and B is before C?

(d) A is before B and C is before D?

(e) A and B are next to each other and C and D are also next to each other?

(f) E is not last in line?

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