1. How many different linear arrangements are there of the letters A, B, C, D, E, F...
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1. 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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