Find:10th term of the A.P. $-40, -15, 10, 35, ……..$
Given:
Given A.P. is $-40, -15, 10, 35, ……..$
To do:
We have to find the 10th term of the given A.P.
Solution:
Here,
$a_1=-40, a_2=-15, a_3=10, a_4=35$
Common difference $d=a_2-a_1=-15-(-40)=-15+40=25$
We know that,
nth term $a_n=a+(n-1)d$
Therefore,
10th term $a_{10}=-40+(10-1)(25)$
$=-40+9\times25$
$=-40+225$
$=185$
The 10th term of the given A.P. is $185$.  
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