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29 August, 04:02

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?

+3
Answers (1)
  1. 29 August, 06:49
    0
    E A B C D?

    i'm think that's what it is
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