1
IIT-JEE 1995 Screening
MCQ (Single Correct Answer)
+2
-0.5
Three of six vertices of a regular hexagon are chosen at random. The probability that the triangle with three vertices is equilateral, equals
A
$$1/2$$
B
$$1/5$$
C
$$1/10$$
D
$$1/20$$
2
IIT-JEE 1995 Screening
MCQ (Single Correct Answer)
+2
-0.5
The probability of India winning a test match against West Indies is $$1/2$$. Assuming independence from match to match the probability that in a $$5$$ match series India's second win occurs at third test is
A
$$1/8$$
B
$$1/4$$
C
$$1/2$$
D
$$2/3$$
3
IIT-JEE 1994
MCQ (Single Correct Answer)
+2
-0.5
Let $$A, B, C$$ be three mutually independent events. Consider the two statements $${S_1}$$ and $${S_2}$$
$${S_1}\,:\,A$$ and $$B \cup C$$ are independent
$${S_2}\,:\,A$$ and $$B \cap C$$ are independent
Then,
A
Both $${S_1}$$ and $${S_2}$$ are true
B
Only $${S_1}$$ is true
C
Only $${S_2}$$ is true
D
Neither $${S_1}$$ nor $${S_2}$$ is true
4
IIT-JEE 1993
MCQ (Single Correct Answer)
+1
-0.25
An unbiased die with faces marked $$1,2,3,4,5$$ and $$6$$ is rolled four times. Out of four face values obtained, the probability that the minimum face value is not less than $$2$$ and the maximum face value is not greater than $$5,$$ is then:
A
$$16/81$$
B
$$1/81$$
C
$$80/81$$
D
$$65/81$$
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