In how many article site we can submit 1n article (repeat)?? I heard that we can submit 1n same article in 5 article directory. Is it true ?
Duplication is not an issue - as you can see that Google would typically give option to user stating some results have been omitted as they are similar. I haven't seen any TOS stating maximum 5 directories is where you can submit. Anything more than 1 in any case is duplicate content but than google doesn't index all and you don't get to lose anything - it is for the owners to decide if they allow dupe content on their sites!
You can submit the same article into the hundreds of article directories. But it will useless. Better: 1 article - 1 directory. Links within unique content are the most valuable.
If you can afford. Try 1 article per article directory. I regularly submit an article to 50 and see that most pages are indexed and shown in search results.
you can submit one article in one site only one time .. but you can submit article in many article directory ..