How many Sql Instances can be installed.

Hi All,

Please let me know how many instances of sql can be installed on below version?

Sql 2000 [Cluster and Non CLustered]

Sql 2005 [Cluster and Non CLustered]

Sql 2008 [Cluster and Non CLustered]

Sql 2012 [Cluster and Non CLustered]

Thanks,

Nani.