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if you are talking about setting up a RAC, and having a database 10g running on one node, and a different database 11g running on the other node this is possible.
You will have to use the newest clusterware/GI (126.96.36.199) and multiple Oracle Homes (One for 10g and one for the 188.8.131.52).
If however you want one database with 2 instances running different versions: Then No.