1
IIT-JEE 1998
MCQ (Single Correct Answer)
+2
-0.5
There are four machines and it is known that exactly two of them are faulty. They are tested, one by one, in a random order till both the faulty machines are identified. Then the probability that only two tests are needed is
A
$$1/3$$
B
$$1/6$$
C
$$1/2$$
D
$$1/4$$
2
IIT-JEE 1998
MCQ (More than One Correct Answer)
+2
-0.5
If $$\overline E $$ and $$\overline F $$ are the complementary events of events $$E$$ and $$F$$ respectively and if $$0 < P\left( F \right) < 1,$$ then
A
$$P\left( {E/F} \right) + P\left( {\overline E /F} \right) = 1$$
B
$$P\left( {E/F} \right) + P\left( {E/\overline F } \right) = 1$$
C
$$P\left( {\overline E /F} \right) + P\left( {E/\overline F } \right) = 1$$
D
$$P\left( {E/\overline F } \right) + P\left( {\overline E /\overline F } \right) = 1$$
3
IIT-JEE 1998
MCQ (Single Correct Answer)
+2
-0.5
If from each of the three boxes containing $$3$$ white and $$1$$ black, $$2$$ white and $$2$$ black, $$1$$ white and $$3$$ black balls, one ball is drawn at random, then the probability that $$2$$ white and $$1$$ black ball will be drawn is
A
$$13/32$$
B
$$1/4$$
C
$$1/32$$
D
$$3/16$$
4
IIT-JEE 1998
MCQ (Single Correct Answer)
+2
-0.5
The order of the differential equation whose general solution is given by
$$y = \left( {{C_1} + {C_2}} \right)\cos \left( {x + {C_3}} \right) - {C_4}{e^{x + {C_5}}},$$ where
$${C_1},{C_2},{C_3},{C_4},{C_5},$$ are arbitrary constants, is
A
$$5$$
B
$$4$$
C
$$3$$
D
$$2$$
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