Question:
A cubic polynomial $f(x) = x^3 + ax^2 + bx + c$ with at least two distinct roots has the following properties:

(i) The sum of all the roots is equal to twice the product of all the roots.
(ii) The sum of the squares of all the roots is equal to 3 times the product of all the roots.
(iii) $f(1) = 1.$

Find $c.$

Answer:
Let $r,$ $s,$ $t$ be the root of the cubic.  Then by Vieta's formulas,
\begin{align*}
r + s + t &= -a, \\
rs + rt + st &= b, \\
rst &= -c.
\end{align*}From condition (i), $-a = -2c,$ so $a = 2c.$

Squaring the equation $r + s + t = -a,$ we get
\[r^2 + s^2 + t^2 + 2(rs + rt + st) = a^2.\]Then
\[r^2 + s^2 + t^2 = a^2 - 2(rs + rt + st) = a^2 - 2b.\]Then from condition (ii), $a^2 - 2b = -3c,$ so
\[b = \frac{a^2 + 3c}{2} = \frac{4c^2 + 3c}{2}.\]Finally, from condition (iii), $f(1) = 1 + a + b + c = 1,$ so $a + b + c = 0.$  Substituting, we get
\[2c + \frac{4c^2 + 3c}{2} + c = 0.\]This simplifies to $4c^2 + 9c = 0.$  Then $c(4c + 9) = 0,$ so $c = 0$ or $c = -\frac{9}{4}.$

If $c = 0,$ then $a = b = 0,$ which violates the condition that $f(x)$ have at least two distinct roots.  Therefore, $c = \boxed{-\frac{9}{4}}.$