Hi, I don’t quite understand the permutation above. Can somebody explain it? This is from the Quant flashcards group 15. Thanks!
Explain what exactly?
Case 1 –> John sits at the left end, so basically, we need to permute the remaining 3 people in the 3 chairs we have towards the right –> 3! = 3x2x1
Case 2 –> John sits at the right end, so basically, we need to permute the remaining 3 people in the 3 chairs we have towards the left –> 3! = 3x2x1
So, in total –> 2x3! = 2x3x2x1 (as shown in the picture)
That makes sense, thank you!
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It’s ok, Jovyn was able to help clarify!
I’m glad I could help 