PDF is very popular these days. Everyone is carrying their documents in PDF format. If you want to delete some unwanted pages from pdf don't rescan documents again. I will show how you can do it without any software. You just need Google chrome for it find following steps.
1. Open your pdf documents in Google chrome
2. Now check pages you want to delete in pdf
3. Now press Ctrl + P to print.
4. Now choose a printer save as pdf
5. Now choose customised Pages
6. Now Choose Pages want to Delete in PDF ( Suppose i have 3 pages in pdf i want to delete 2nd page in pdf then i will choose 1,3)