ok if a card or cards are removed from play do they stay removed for the duel or just that battle because the people at the turment play the way that they are removed for just that batla

i knjow that it is the duel but just wanted to ask

If a card is removed from play, it stays removed from play until the Duel ends or something brings it back, usually a card effect like "Dimension Fusion" or when "Strike Ninja" brings himself back.

I think he wants to know if they are removed from all 3 duels or 2 duels and the answer is no. once you start another duel all removed cards go back in your deck.

yes that is what i wanted to know
a duel contains 3 battles right
who ever wins 2 battles win the duel
but if a monste is removed from play during the 1 battle does it stay removed for the othr 2 battles no that i think of it they shouldent be because you deck has to have 40 cards

Actually the terms are Match and Duel, not Duel and Battle. Each Match contains three Duels. And not every instance of playing is a Match, a lot of people who duel for fun only play one Duel and not a Match.

And since they only stay removed from play until the end of the Duel, they will be available for the next Duel(s).