Hi  

if the 6 physics books are kept together and the 5 geometry books are kept together..

You have two groups... 2! ways of arranging the two groups

IF THE PHYSICS BOOKS AND GEIOMETY BOOKS ARE DIFFERENT FROM ONE ANOTHER RESPECTIVELY

Within the groups...  6! for Physics and 5 factorial for geometry

Ways:  2![6!][5!] = 2[6*5*4*3*2*1][5*4*3*2*1]

Wish You the Best in your Studies.

(Your calculator may have a factorial function on it)



 

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