1 Probability
If heads means one and tail means two, then coefficients of quadratic equation $$a{x}^{2}+bx+c=0$$ are chosen by tossing three fair coins. The probability that roots of the equation are imaginary is
1) $$\displaystyle\frac { 5 }{ 8 } $$ 2) $$\displaystyle\frac { 3 }{ 8 } $$ 3) $$\displaystyle\frac { 7 }{ 8 } $$ 4) $$\displaystyle\frac { 1 }{ 8 } $$
$${b}^{2}-4ac<0$$
Your Score:
