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Open your PDF file in Acrobat or Acrobat Reader

Select File > Print … from the menu bar

Select the Printer
Select Properties. Enter the properties for A3, full colour, landscape
Select the Advanced button (next to Properties) on the Print menu

Select Print As Image, then click OK

Under Page Sizing & Handling, select Fit, Orientation – select Auto portrait/landscape, then click Print

Job done!
Laminate your print and hang!