If \( a, b, c \) are real numbers such that \( a+b+c=0 \), \( \math...

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If \( a, b, c \) are real numbers such that \( a+b+c=0 \),
\( \mathrm{P} \)
then the quadratic equation \( 3 a x^{2}+2 b x+c=0 \) has
W
(1) At least one root in \( [0,1] \)
(2) At least one root in \( [1,2] \)
(3) At least one root in \( [-1,0] \)
(4) None of these
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