MathematicsMedium75×since 2002Q4911The coefficients a, b and c of the quadratic equation, ax² + bx + c = 0 are obtained by throwing a dice three times. The probability that this equation has equal roots is :A172{1 \over {72}}721B5216{5 \over {216}}2165C136{1 \over {36}}361D154{1 \over {54}}541Check answerSkip