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1
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

One Indian and four American men and their wives are to be seated randomly around a circular table. Then the conditional probability that the Indian man is seated adjacent to his wife given that each American man is seated adjacent to his wife is

A
$$\frac{1}{2}$$
B
$$\frac{1}{3}$$
C
$$\frac{2}{5}$$
D
$$\frac{1}{5}$$
2
IIT-JEE 2007 Paper 1 Offline
MCQ (Single Correct Answer)
+3
-1

Let H$$_1$$, H$$_2$$, ..., H$$_n$$ be mutually exclusive and exhaustive events with P(H$$_i$$) > 0, i = 1, 2, ..., n. Let E be any other event with 0 < P(E) < 1.

Statement 1 : P(H$$_i$$ | E) > P(E | H$$_i$$). P(H$$_i$$) for $$i=1,2,...,n$$.

Statement 2 : $$\sum\limits_{i = 1}^n {P({H_i}) = 1} $$.

A
Statement 1 is True, Statement 2 is True, Statement 2 is a CORRECT explanation for Statement 1
B
Statement 1 is True, Statement 2 is True, Statement 2 is NOT a CORRECT explanation for Statement 1
C
Statement 1 is True, Statement 2 is False
D
Statement 1 is False, Statement 2 is True
3
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

There are $$n$$ urns each containing $$n+1$$ balls such that the $$i^{\text {th }}$$ urn contains $$i$$ white balls and $$(n+1-i)$$ red balls. Let $$u_{i}$$ be the event of selecting $$i^{\text {th }}$$ urn, $$i =1,2,3 \ldots, n$$ and $$w$$ denotes the event of getting a white ball.

If $$\mathrm{P}\left(u_{i}\right) \propto i$$, where $$i=1,2,3, \ldots n$$, then $$\lim_\limits{n \rightarrow \infty} \mathrm{P}(w)$$ is equal to:

A
1
B
$$\frac{2}{3}$$
C
$$\frac{3}{4}$$
D
$$\frac{1}{4}$$
4
IIT-JEE 2006
MCQ (Single Correct Answer)
+3
-1

There are $$n$$ urns each containing $$n+1$$ balls such that the $$i^{\text {th }}$$ urn contains $$i$$ white balls and $$(n+1-i)$$ red balls. Let $$u_{i}$$ be the event of selecting $$i^{\text {th }}$$ urn, $$i =1,2,3 \ldots, n$$ and $$w$$ denotes the event of getting a white ball.

If $$\mathrm{P}\left(u_{i}\right)=c$$, where $$c$$ is a constant then $$\mathrm{P}\left(u_{n} / w\right)$$ is equal to:

A
$$\frac{2}{n+1}$$
B
$$\frac{1}{n+1}$$
C
$$\frac{n}{n+1}$$
D
$$\frac{1}{2}$$

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