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1
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
Two aeroplanes $${\rm I}$$ and $${\rm I}$$$${\rm I}$$ bomb a target in succession. The probabilities of $${\rm I}$$ and $${\rm I}$$$${\rm I}$$ scoring a hit correctly are $$0.3$$ and $$0.2,$$ respectively. The second plane will bomb only if the first misses the target. The probability that the target is hit by the second plane is
A
$$0.2$$
B
$$0.7$$
C
$$0.06$$
D
0.32
2
AIEEE 2007
MCQ (Single Correct Answer)
+4
-1
A pair of fair dice is thrown independently three times. The probability of getting a score of exactly $$9$$ twice is
A
$$8/729$$
B
$$8/243$$
C
$$1/729$$
D
$$8/9.$$
3
AIEEE 2006
MCQ (Single Correct Answer)
+4
-1
At a telephone enquiry system the number of phone cells regarding relevant enquiry follow Poisson distribution with an average of $$5$$ phone calls during $$10$$ minute time intervals. The probability that there is at the most one phone call during a $$10$$-minute time period is
A
$${6 \over {{5^e}}}$$
B
$${5 \over 6}$$
C
$${6 \over 55}$$
D
$${6 \over {{e^5}}}$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Three houses are available in a locality. Three persons apply for the houses. Each applies for one house without consulting others. The probability that all the three apply for the same house is
A
$${2 \over 9}$$
B
$${1 \over 9}$$
C
$${8 \over 9}$$
D
$${7 \over 9}$$
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