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

If the probability for A to fail in an examination is 0.2 and that for B is 0.3, then the probability that either A or B fail is

A
0.38
B
0.44
C
0.50
D
0.94
2
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Three vertices are chosen randomly from the seven vertices of a regular 7-sided polygon. The probability that they form the vertices of an isosceles triangle is

A
$$\frac{1}{7}$$
B
$$\frac{1}{3}$$
C
$$\frac{3}{7}$$
D
$$\frac{3}{5}$$
3
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
$$\frac{1}{3}$$
4
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
$$\frac{17}{3^5}$$
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