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Q.

The coefficients b and c of the equation x2+bx+ c=0  are determined by throwing an ordinary die. The probability that the equation has equal roots is

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a

118

b

1318

c

518

d

19

answer is A.

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Detailed Solution

b2=4c (b,c)=(2,1),(4,4) P(E)=236=118
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The coefficients b and c of the equation x2+bx+ c=0  are determined by throwing an ordinary die. The probability that the equation has equal roots is