Three symmetrical dice are thrown. The probability of obtaining a sum of 16 points is

1.  1/72

2.  1/216

3.  1/36

4.  1/6

View Answer  
4
Correct Answer :

1/36


Explanation :
No Explanation available for this question

If the lines x+y+1=0,3x+4y+1=0 touch the circle,its centre lies on

1.  x+y+1/√2=(3x+4y+1)/5

2.  x+y-1/√2=3x+4y+1/5

3.  x+y+1/√2 = 3x+4y-1/5

4.  x-y-1/√2=3x+4y+1/5

View Answer  
4
Correct Answer :

x+y+1/√2=(3x+4y+1)/5


Explanation :
No Explanation available for this question

Ifx+2y-5=0 is a tangent to x2+y2-4x+2y+c=0 then the point of contact of the parallel tangent is

1.  (3,1)

2.  (1,3)

3.  (-3,1)

4.  (1,-3)

View Answer  
4
Correct Answer :

(1,-3)


Explanation :
No Explanation available for this question

The probability of getting at least one head when we toss 3 unbiased coins is

1.  1/8

2.  7/8

3.  5/8

4.  3/8

View Answer  
4
Correct Answer :

7/8


Explanation :
No Explanation available for this question

If the tangents from any point on the circle x2+y2=a2 to the circle x2+y2=b2 are perpendicular then

1.  b=2a

2.  a=2b

3.  b2=2a2

4.  a2=2b2

View Answer  
4
Correct Answer :

a2=2b2


Explanation :
No Explanation available for this question

If the tangent at (1,-2) to the circle x2+y2=5 touches the circle x2+y2-8x+6y+20=0 at p.Then Py =

1.  3

2.  1

3.  -1

4.  2

View Answer  
4
Correct Answer :

-1


Explanation :
No Explanation available for this question

When a fair coin is tossed thrice, the probability of obtaining head at most twice is

1.  3/8

2.  7/8

3.  5/8

4.  1/8

View Answer  
4
Correct Answer :

7/8


Explanation :
No Explanation available for this question

A fair coin is tossed 4 times. The probability that heads exceed tails in number is

1.  1/17

2.  5/16

3.  1/4

4.  3/16

View Answer  
4
Correct Answer :

5/16


Explanation :
No Explanation available for this question

An unbiased coin is tossed n times. The probability that head will present itself, odd number of times is

1.  1/5

2.  1/2

3.  1/3

4.  1/4

View Answer  
4
Correct Answer :

1/2


Explanation :
No Explanation available for this question

The probability of obtaining 4 heads,4 tails when 8 unbiased coins are tossed is

1.  1/4

2.  8c0/28

3.  8c4/28

4.  1/2

View Answer  
4
Correct Answer :

8c4/28


Explanation :
No Explanation available for this question
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