9! = 9*8*7*6*5*4*3*2*1 = 362880
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10*9*8 = 720
How many different ways can we arrange 9 objects taken 3 at a time?
Permutations are the different arrangements of any number of objects. When we arrange some objects in different orders, we obtain different permutations.Therefore, you can't say "What is the permutation of 5?". To calculate permutations, one has to get the following details:The total number of objects (n) (necessary)The number of objects taken at a time (r) (necessary)Any special conditions mentioned in the question (optional).
Ifk
Do a web search for "permutations and combinations" to find the how. I make it 35,960.