Question
Check whether the following sequence is in A.P.
9, 13, 17, 21, 25, ...
9, 13, 17, 21, 25, ...
✓
Answer
$9,13,17,21,25, \ldots$
$t_2-t_1=13-9=4$
$t_3-t_2=17-13=4$
$t_4-t_3=21-17=4$
$t_5-t_4=25-21=4$
Common difference are equal
$\therefore$ The sequence is in A.P.
$t_2-t_1=13-9=4$
$t_3-t_2=17-13=4$
$t_4-t_3=21-17=4$
$t_5-t_4=25-21=4$
Common difference are equal
$\therefore$ The sequence is in A.P.
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