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please check my answer in this problem

please check my answer in this problem

by Sinjan Jana -
Number of replies: 2
to see the question please click here
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Now please have a look at my answer:

step 1: please click here to look

step 2: please click here to look

so, that was my solution,

Answer given in the text book is only 3.

DID I GO WRONG ANYWHERE??
In reply to Sinjan Jana

Re: please check my answer in this problem

by Manish Verma -
Looking at the question and your final answers, it appears that the domain has not been checked. When we say 4Pr then we cannot pick up more that 4 things to arrange if we just have 4 things, i.e. r cannot be 8.