Question
Wed April 13, 2011 By: Prateek Kumar

how is (l-2d)+(l-d)+l mean in AP

Expert Reply
Wed April 13, 2011
An A.P is a progression (sequence) obtained by adding a fixed number to the previous term.
 
Thus (1-2d) + d = 1-d
       (1-d)  +d = 1.
 
Hence 1-2d, 1-d and 1 are in A.P.
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