Either use Delete Pages In Pdf pro or use this. It's free version may help you in deleting required page. FlexiPDF
Use PDF Viewer X to inspect this PDF file or one like it. Open the document and copy the text from page 13-23, then paste in any editor. You can download PDF files from the Internet. Paste a page into the PDF Editor. Open it up in any PDF editor you fancy, i.e. Microsoft Word, Google Docs, etc. Use Adobe PDF, Adobe Reader, and Adobe Acrobat. Use the PDF Editor and a simple page-scan or search-and-replace tool. It was originally named Page Viewer for Apple OS X and iOS, but it is just referred as PDF Viewer on the internet. You can search PDF documents using Spotlight, from your iPhone using Pages, or using iBooks 2 on your iPad. This will allow you to do a lot more research while you are working, but it requires you to look for certain word-combinations, so will be limited to certain applications.