Question

If the three linear equations $x + 4ay + az = 0$ $x + 3 by + bz = 0$ and $x + 2cy + cz = 0$ have a non-trivial solution, then a, b, c are in

• A. A.P
• B. G.P.
• C. H.P
• D. none of these.

Answer 1

Answer: (C)

H.P

Answer 2

- For non-trival solution $\begin{vmatrix}1&4a&a\\\ 1&3b&b\\\ 1&2c&c\end{vmatrix}$ = 0