1
IIT-JEE 1986
MCQ (Single Correct Answer)
+2
-0.5
The probability that at least one of the events $$A$$ and $$B$$ occurs is $$0.6$$. If $$A$$ and $$B$$ occur simultaneously with probability $$0.2,$$ then $$P\left( {\overline A } \right) + P\left( {\overline B } \right)$$ is
A
$$0.4$$
B
$$0.8$$
C
$$1.2$$
D
$$1.4$$
2
IIT-JEE 1984
MCQ (Single Correct Answer)
+2
-0.5
Three identical dice are rolled. The probability that the same number will appear on each of them is
A
$$1/6$$
B
$$1/36$$
C
$$1/18$$
D
$$3/28$$
3
IIT-JEE 1984
MCQ (Single Correct Answer)
+2
-0.5
A box contains $$24$$ identical balls of which $$12$$ are white and $$12$$ are black. The balls are drawn at random from the box one at a time with replacement. The probability that a white ball is drawn for the $$4$$th time on the $$7$$th draw is
A
$$5/64$$
B
$$27/32$$
C
$$5/32$$
D
$$1/2$$
4
IIT-JEE 1983
MCQ (Single Correct Answer)
+1
-0.25
Fifteen coupons are numbered $$1, 2 ........15,$$ respectively. Seven coupons are selected at random one at a time with replacement. The probability that the largest number appearing on a selected coupon is $$9,$$ is
A
$${\left( {{9 \over {16}}} \right)^6}$$
B
$${\left( {{18 \over {15}}} \right)^7}$$
C
$${\left( {{3 \over {5}}} \right)^7}$$
D
none of these
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