9,12,7,10,5,8,3 in series number

+3-5 is the series
 
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9,12,7,10,5,8,3,6,1......
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I am not able to understand please write your question properly
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+3-5 is the actual series
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9 12 7 10 5 8 3
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Tell numerical series 9,12 ,7,10,5
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What are you looking for?