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1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

If A, B and C are three mutually exclusive and exhaustive events such that P(A) = 2P(B) = 3P(C). What is P(B)?

A
$$\frac{6}{11}$$
B
$$\frac{6}{22}$$
C
$$\frac{1}{6}$$
D
$$\frac{1}{3}$$
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

A multiple choice examination has 5 questions. Each question has three alternative answers of which exactly one is correct. The probability that a student will get 4 or more correct answer just by guessing, is

A
$$\frac{13}{3^5}$$
B
$$\frac{11}{3^5}$$
C
$$\frac{10}{3^5}$$
D
$$\frac{17}{3^5}$$
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

The coefficients a, b and c of the quadratic equation, $$ax^2+bx+c=0$$ are obtained by throwing a dice three times. The probability that this equation has equal roots is

A
$$\frac{1}{72}$$
B
$$\frac{5}{216}$$
C
$$\frac{1}{36}$$
D
$$\frac{1}{54}$$
4
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Three of the six vertices of a regular hexagon are chosen at random. The probability that the triangle with three vertices is equilateral equals

A
$$\frac{1}{2}$$
B
$$\frac{1}{5}$$
C
$$\frac{1}{10}$$
D
$$\frac{1}{20}$$
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