Hi,

How many ways can six out of 12 cars be lined up 'in order' is 12P6

Ways of lining up four out of five trucks 'in order' is 5P4 



How many ways can six out of 12 cars be lined up in order, 

followed by lining up four out of five trucks in order?

   12P6*5P4 = 665,280*120 = 79,833,600 ways



For ex 12P6 can be found on a scientific calculator : 12!/6! = 665,280 

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