Which term of the AP: \( 53,48,43, \ldots \) is the first negative term?
Given:
Given A.P. is \( 53,48,43, \ldots \)
To do:
We have to find which term of the given A.P. is its first negative term.
Solution:
Here,
$a_1=53, a_2=48, a_3=43$
Common difference $d=a_2-a_1=48-53=-5$
The first negative term of the given A.P. $=53-5\times11=53-55=-2$ ($53-5\times10=3$ is the last positive term)
We know that,
nth term $a_n=a+(n-1)d$
Therefore,
$a_{n}=53+(n-1)(-5)$
$-2=53+n(-5)-1(-5)$
$-2-53=-5n+5$
$55+5=5n$
$5n=60$
$n=\frac{60}{5}$
$n=12$
Hence, the first negative term is the 12th term of the given A.P.
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