PageRange

public PageRange(int from, int to)

Document doc = new Document(MyDir + "Images.docx");

ImageSaveOptions imageOptions = new ImageSaveOptions(SaveFormat.Tiff);
PageSet pageSet = new PageSet(new PageRange(1, 1), new PageRange(2, 3), new PageRange(1, 3),
    new PageRange(2, 4), new PageRange(1, 1));

imageOptions.PageSet = pageSet;
doc.Save(ArtifactsDir + "ImageSaveOptions.ExportVariousPageRanges.tiff", imageOptions);