Question
Write the correct number in the given boxes from the following A. P.
3, 6, 9, 12, . . .
$\text { Here } t _1=\square, t _2=\square, t _3=\square, t _4=\square, $
$ t _2- t _1=\square, t _3- t _2=\square$
$\therefore d =\square$

Answer

$3,6,9,12, \ldots$
First term a $=3$
Second term $t _1=6$
Third term $t_2=9$
Fourth term $t_3=12$
We know that $d=t_{n+1}-t_n$
Thus, $t_2-t_1=9-6=3$
$t_3-t_2=12-9=3$
Thus, $d=3$

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