Multiple choice

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 } $
Reveal answer Fill a bubble to check yourself
C Correct answer