3 red and 4 white balls of different sizes are arranged in a row at random. The probability that no two balls of the same colour are together is

1.  6/35

2.  3/35

3.  1/35

4.  9/35

View Answer  
4
Correct Answer :

1/35


Explanation :
No Explanation available for this question

A box X contains 2 white and 3 black balls and another bag Y contains 4 white and 2 black balls. One bag is selected at random and ball is drawn from it. Then the probability for the ball chosen be white is

1.  2/15

2.  7/15

3.  8/15

4.  14/15

View Answer  
4
Correct Answer :

8/15


Explanation :
No Explanation available for this question

A box contains 40 balls of the same shape and weight. Among the balls 10 are white, 16 are red and the rest are black, the probability that a ball drawn from the box is not a black is

1.  1/4

2.  2/5

3.  13/20

4.  1/20

View Answer  
4
Correct Answer :

13/20


Explanation :
No Explanation available for this question

A bag contains 4 white and 2 black balls. Another contains 3 white and 5 black balls. If one ball is drawn from each, the probability that both are white is

1.  13/24

2.  5/24

3.  1/4

4.  2/14

View Answer  
4
Correct Answer :

1/4


Explanation :
No Explanation available for this question

If the two equations x2-cx+d=0 and x2-ax+b=0 have a common root and the second equation has equal roots,then

1.  b+d=ac

2.  2(b+d)=ac

3.  b+d=2ac

4.  (b+d)2=a+c

View Answer  
4
Correct Answer :

2(b+d)=ac


Explanation :
No Explanation available for this question

Three balls are drawn from a collection of 7 white, 12 green and 4 red balls. The probability that each is of different colour is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Three squares of a chess board having 8x8 squares being chosen at random, the chance that all the three are white is

1.  32C3/64C3

2.  8C3/64C3

3.  16C3/64C3

4.  4C3/64C3

View Answer  
4
Correct Answer :

32C3/64C3


Explanation :
No Explanation available for this question

In a class 40% of students read History, 25% Civics and 15% both History and Civics. If a student is selected at random from that class, the probability that he reads history, if it is known that he reads Civics is

1.  1/5

2.  2/5

3.  3/5

4.  3/8

View Answer  
4
Correct Answer :

3/5


Explanation :
No Explanation available for this question

An experiment yields 3 mutually exclusive and exhaustive events A,B and C. If P(A)=2P(B)=3P(C) then P(A)=

1.  1/11

2.  2/11

3.  23/11

4.  6/11

View Answer  
4
Correct Answer :

6/11


Explanation :
No Explanation available for this question

S={1,2,3….20} if 3 numbers are chosen at random from S, the probability for they are in A.P is

1.  3/38

2.  35/33

3.  33/35

4.  1/38

View Answer  
4
Correct Answer :

3/38


Explanation :
No Explanation available for this question
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