Hi,

Re reply: thanks for clarifying that Bill does not have to speak directly after A

A first: 24 ways (4!)

B first: N/A

C first: 12 ways 

CA 3!, CB N/A, CD: CDA 2!, CDB N/A, CDEAB 1, CE: CEA 2!, CEB N/A, CEDAB 1 

D first: 12 ways

E first: 12 ways 

Five persons, A, B, C, D, E, are going to speak at a meeting. 

In how many orders can they take their turns if B must speak after A? 4!

Think of AB as one Unit:   

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