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June 7th, 2019, 03:10 AM  #1 
Newbie Joined: Jun 2019 From: Italy Posts: 3 Thanks: 0 
I posted this question in the wrong section, so I post it again here, sorry guys! I'm trying to solve a combinatorial problem, more precisely I have the following data: 1) the Italian car number plates are given starting from 1993 in succession according to this criterion, the first plate of the history was AA000AA, the second AA000AB and so on until the combinations with the last two letters are finished, then the first ones are changed two letters and finally numbers; 2) According to this criterion it is possible to register a maximum of 134,256,000 different number plates 3) In 1993, 1.7 million number plates were registered in 1994 1.7 million in 1995 1.7 million in 1996, 1.7 million in 1997, 2.4 million in 1998, 2.4 million in 1999, 2.3 million in 2000 2.4 million in 2001 2.4 million in 2002 2.3 million in 2003 2.2 million in 2004 2.3 million in 2005 2.2 million in 2006 2.3 million in 2007 2.5 million in 2008 2.1 million in 2009, 2.1 million in 2010 1.9 million in 2011 1.7 million in 2012 1.4 million in 2013 1 million For a total of 42.8 million different number plates created until 2013 4) Knowing these data go up for each year from which plate you started to which plate you arrived. I don't know how to calculate it. What formulas should I use? Thanks in advance to anyone who can help me! Last edited by skipjack; June 7th, 2019 at 04:33 AM. 
June 7th, 2019, 12:48 PM  #2 
Math Team Joined: Jul 2013 From: काठमाडौं, नेपाल Posts: 901 Thanks: 61 Math Focus: सामान्य गणित  

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calculation, combinatorial 
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