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Two A.P.s have the same common difference. The first term of one of these is $-1$ and that of the other is $-8$. Then find the difference between their $4^{th}$ terms.
Given: Two A.P.s have the same common difference. The first term of one of these is $-1$ and that of the other is $-8$.
To do: To find the difference between their $4^{th}$ terms.
Solution:
Let $d$ be common difference of both A.P.
For $1^{st}$ A.P.-
First term, $a=-1$
$\therefore\ 4^{th}$ term, $a_4=a+( 4-1)d$
$a_4=-1+3d\ ..........\ ( i)$
For $2^{nd}$ A.P.-
First term, $a=-8$
Common difference$=d$
$\therefore\ 4^{th}$ term, $a_4=-8+( 4-1)d$
$\Rightarrow a_4=-8+3d\ ..........\ ( ii)$
Difference between the $4^{th}$ term of both A.P.$=-1+3d-( -8+3d)$
$=-1+3d+8-3d$
$=7$
Thus, the difference between the $4^{th}$ term of the both A.P. is $7$.
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