Check whether the following sequences are in A.P. (iii) 9, 13, 17, 21, 25,...

Check whether the following sequences are in A.P.
(iii) 9, 13, 17, 21, 25,...
Solution :
d = t2 - t1
d = 13 - 9
d  = 4
d = t3 - t2
d = 17 - 13
d  = 4
The given sequence is an arithmetic progression.

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