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As u have not provide the AP terms, so can't tell you the next terms.
But let me tell you how to identify , whether the terms are in AP or not.
Find the difference of consecutive terms, if they are same then they are in AP.
For Example, 1,3,5,7,9.... 
when you see the difference of consecutive terms,
so here difference is same , so they are in AP.

Hope this will help you.
1 4 1