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Raju SudheerRaju Sudheer 

what is the mean by last three digit in external ID?

viruSviruS
External Id could be  Any Number,Email Or Text .. so nothing special with Last Three Digits. If you are asking about Id Structures please go through https://help.salesforce.com/apex/HTViewSolution?urlname=How-do-unique-IDs-work-in-Salesforce-1327108651310&
Shailendra Singh ParmarShailendra Singh Parmar
I beleive that you are talking about salesforce ID when it is 18 disit. 
http://interviewqa.forcetree.com/2014/03/what-is-difference-between-15-digit-and.html