Drupal: How to hide/delete/display Page Title

First Case:

I need to hide/delete title Announcement .... in list of announcement page.

Solution:

1. Go to sites/all/theme/yourtheme/views-view-unformatted.tpl.php
2. Edit the php script.
3. Save and refresh the page.
4. See the changes.

*** To change format for announcement also in this file


Second Case:

I want to remain display page title in any particular page.

Solution:

1. Go to sites/all/theme/yourtheme/page.tpl.php
2. Edit the php script.
3. Save and refresh the page.
4. See the changes.