The number of real roots of the equation $${x^2} - 3\left| x \right| + 2 = 0$$ is

If the sum of the roots of the equation $$a{x^2} + bx + c = 0$$ is equal to the sum of their squares, then

If the roots of the equation x² $$-$$ nx + m = 0 differ by 1, then

If a, b and c are the sides of a $$\Delta$$ABC, then $${a^{{1 \over p}}} + {b^{{1 \over p}}} - {c^{{1 \over p}}}$$, where p > 1, is