2. How many ways are there to rearrange the letters ABCDEF
when
(a) A is before B and B is before C?
(c) A is not first.
(b) A is before B and C is before D? (c) A is not first.
(d) A is not first and F is not last?
2. How many ways are there to rearrange the letters ABCDEF when (a) A is before B and B is before C? (c) A is not first.
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