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Is $-150$ a term of the A.P. $11, 8, 5, 2, ……$?
Given:
Given A.P. is $11, 8, 5, 2, …..$
To do:
We have to find whether $-150$ is a term of the given A.P.
Solution:
Here,
$a_1=11, a_2=8, a_3=5, a_4=2$
Common difference $d=a_2-a_1=8-11=-3$
If $-150$ is a term of the given A.P. then $a_n=-150$, where $n$ is a natural number.
We know that,
nth term $a_n=a+(n-1)d$
Therefore,
$a_{n}=11+(n-1)(-3)$
$-150=11+n(-3)-1(-3)$
$-150-11=-3n+3$
$161+3=3n$
$3n=164$
$n=\frac{164}{3}$
$\Rightarrow n=54\frac{2}{3}$, which is not a natural number.
Hence, $-150$ is not a term of the given A.P.    
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