Lipschutz, Seymour Lipson Marc Lars <br/><br/>
Discrete Mathematics 

 - 3 
 - New York  McGraw-Hill  2019 
 - p.690 
<br/><br/><label>ISBN: </label>9781259062537 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Setys and Elements<br/>Product Sets<br/>Factorial NOtation
<br/><br/><label>Dewey Class. No.: </label>512.0076 L767D