MS Power Point
The difference between Slide Design and Auto Content Wizard is

Slide Design asks your choice in steps but Auto Content Wizard does not let you make choices
Slide Design does not provide sample content but Auto Content Wizard provides sample content too!
Both are same
AutoContent Wizard is just the wizard version of Slide Design

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MS Power Point
To insert slide numbers

Choose Insert >> Slide Number
Insert a textbox and select Insert >> Number >> PageNumber
Insert a text box and select Insert >> Page Number
Insert a new text box and select Insert >> slide Number

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