$$I_1, I_2  and  I_3$$ are lines in a plane. Is $$I_1$$ perpendicular to $$I_3$$?

A. $$I_1$$ is perpendicular to $$I_2$$

B. $$I_2$$ is perpendicular to $$I_3$$

Clearly, each statement alone is insufficient, as there is information about only two lines in each statement.

By combining, both statements, we get that if $$I_1$$ is perpendicular to $$I_2$$ and $$I_2$$ is perpendicular to $$I_3$$ , then $$I_1$$ is parallel to $$I_3$$

Thus, the answer to the question is : No, $$I_1$$ is not perpendicular to $$I_3$$, which is feasible by combining both statements.

=> Ans - (C)