Probabilities that Rajesh passes in Math, Physics and Chemistry are m, p and c respectively. Of these subjects, Rajesh has a 75% chance of passing in at least one, 50% chance of passing in at least two and 40% chance of passing in exactly two. Find which of the following is true

1.  p + m + c = 19/20

2.  p + m + c = 27/20

3.  pmc = 1/20

4.  pmc = 1/8.

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4
Correct Answer :

p + m + c = 27/20


Explanation :
No Explanation available for this question

There are 5 envelopes corresponding to 5 letters. If the letters are placed in the envelopes at random, what is the probability that all the letters are not placed in the right envelopes

1.  119/120

2.  59/60

3.  23/24

4.  45/55.

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4
Correct Answer :

119/120


Explanation :
No Explanation available for this question

For the above question what is the probability that no single letter is placed in the right envelope.

1.  12/35

2.  11/30

3.  12/25

4.  3/12.

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4
Correct Answer :

11/30


Explanation :
No Explanation available for this question

An urn contains four tickets having numbers 112,121, 211,222 written on them. If one ticket is drawn at random and Ai (i = 1, 2, 3) be the event that the ith digit from left of the number on ticket drawn is 1, which of these can be said about the events Alf A2 and A3

1.  They are mutually exclusive

2.  A1 and A3 are not mutually exclusive to A2

3.  A1 and A3 are mutually exclusive

4.  Both b and c.

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4
Correct Answer :

A1 and A3 are not mutually exclusive to A2


Explanation :
No Explanation available for this question

The probability that a contractor will get a plumbing contract is 2/3 and the probability that he will get an electric contract is 5/9, If the probability of getting at least one contract is 4/5, what is the probability that he will get both die contracts

1.  19/45

2.  13/45

3.  12/35

4.  11/23.

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4
Correct Answer :

19/45


Explanation :
No Explanation available for this question

If P(A) = 3/7, P(B) = 1/2 and P(A' ∩ B') = 1/14, then are A and B are mutually exclusive events

1.  No

2.  Yes

3.  Either yes or no

4.  Cannot be determined.

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4
Correct Answer :

Yes


Explanation :
No Explanation available for this question

Six boys and six girls sit in a row at random. Find the probability that the boys and girls sit alternately.

1.  1/132

2.  1/462

3.  1/623

4.  1/231.

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4
Correct Answer :

1/462


Explanation :
No Explanation available for this question

A. problem on mathematics is given to three students whose chances of solving it are 1/2,1/3 and 1/4 respec­tively. What is the chance that the problem will be solved

1.  2/3

2.  3/4

3.  1/3

4.  1/2.

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4
Correct Answer :

3/4


Explanation :
No Explanation available for this question

A and B throw a pair of dice alternately. A wins if he throws 6 before B throws 5 and 5 wins if he throws 5 before A throws 6. Find B's chance of winning if A makes the first throw.

1.  1/2

2.  5/12

3.  1/3

4.  5/11.

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4
Correct Answer :

5/11.


Explanation :
No Explanation available for this question

Two persons A and B toss a coin alternately till one of them gets Head and wins the game. Find B’s chance of winning if A tosses the coin first.

1.  1/3

2.  2/3

3.  1/2

4.  None of these.

View Answer  
4
Correct Answer :

1/3


Explanation :
No Explanation available for this question
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