Discrete maths Combinatorics

Question

in c) This is how I did

 

But I didn't get this given solution 

Plz explain.. thanks

Comments

Without any restriction on bride and groom arrangement the number of arrangements are 6! , now bride is positioned always left of groom and also consider groom to left side possibility both are equally possible so there is chance to choose among thing 6! only half possibilities = 720/2 = 360 

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but this could be applicable to any of 6 persons