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Mathematics-Online problems:

Interactive Problem 697:

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
How many relations do exist between two sets $ A$ and $ B$, with each of the sets containing three elements? How many of them are mappings, and how many thereof are surjective?

solution:
Relations in total:
Mappings:
Surjective mappings:

   

see also:

  automatically generated: 8/11/2017