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English definition of “arithmetical/arithmetic progression”

arithmetical/arithmetic progression

noun [C]    
a sequence (= ordered series of numbers) in which the numbers get bigger or smaller by the same amount, such as 3, 6, 9..., or 9, 6, 3Numerical relationships
(Definition of arithmetical/arithmetic progression noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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