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2015-02-18T20:54:16+05:30

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ARITHMETIC PROGRESSION MEANS SEQUENCE OF NUMBER HAVE DIFFERENCE BETWEEN THE CONSECUTIVE TERM IS CONSTANT. 
EG:- 2,4,6,8..........Nth TERM

D= COMMON DIFFERENCE
A= FIRST TERM
N= Nth TERM

an= a+(n-1)*d
0
a sequence of numbers in which each differs from the preceding by a constant quantity (e.g., 3, 6, 9, 12, etc.; 9, 7, 5, 3, etc.).