If `a ,\ b ,\ c` are in A.P., find the value of `|2y+4 5y+7 8y+a3y+5 6y+8 9y+b4y+6 7y+9 10 y+c|` .

Answer

Ans `=0`

Explanation

If `a, b, c` are in AP then `b-a=c-b`
$$ \Rightarrow 2 \mathrm{~b}-\mathrm{a}-\mathrm{c}=0 $$
Multiplying and dividing by 2 to `R_{2}`
$$
\begin{aligned}
&\frac{1}{2}\left|\begin{array}{ccc}
...