How many faces does a open cube box have ?

Given :- an open cube box

To find : the number of faces in an open cube box.

In an open cube box, one of the face of a cube is missing. Therefore, the no. of faces required to form an open box is only 5 instead of 6 faces as in a closed box.

On unfolding the given open cube box and counting the number of faces, we get:-   

                                                                                  No. of faces $=5$

Hence, the number of faces in an open cube box is $6-1=5$ faces and the correct option will be option C.