Permutaion Or Combimnation ? Then Solve .  6 Books to be arranged on a shelf 

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You may rearrange the 6 books on the shelf in different ways and you may find the number of permutations using factorial formula such that:

`n! = 1*2*3*...*(n-2)*(n-1)*n`

Hence, reasonign by analogy yields:

`6! = 1*2*3*4*5*6 => 6!...

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