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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