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thank you...can you explain this briefly..plzI don't know much about displays but I found these....
About Resolution..
https://en.wikipedia.org/wiki/Display_resolution
As I know about arbitrary resolution display devices, these devices have displays which does not comes under the 'list of common display resolution'. That is, 1000x400 or 300x100 etc. are arbitrary resolutions, (can be considered as custom made) and 1027x768 or 640x480 are common resolutions.
Hope it helps..