If the circles x2+y2+2x+c=0 and x2+y2+2y+c=0 touch each other then c=

1.  1/2

2.  1/4

3.  2

4.  4

View Answer  
4
Correct Answer :

1/2


Explanation :
No Explanation available for this question

If the number of common tangents of the circles x2+y2+8x+6y+21=0, x2+y2+2y-15=0 are 2,then the point of their intersection is

1.  (-4,-3)

2.  (-8,-5)

3.  (8,-5)

4.  (8,5)

View Answer  
4
Correct Answer :

(-4,-3)


Explanation :
No Explanation available for this question

Four persons draw a card each from a well shuffled pack of 52 cards without replacement at random. The probability that they are a card from each suit is

1.  (13x12x11x10)/524

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

Five cards are drawn at random from a well shuffled pack of 52 playing cards. The probability that four of them may have the same face value is

1.  

2.  

3.  

4.  

View Answer  
4
Correct Answer :


Explanation :
No Explanation available for this question

If the coefficient of x7 in (ax2+(1/bx))11 is equal to the coefficient of x-7 in (ax2+(1/bx))11 then

1.  ab=-1

2.  a=b

3.  ab=1

4.  a+b=0

View Answer  
4
Correct Answer :

ab=1


Explanation :
No Explanation available for this question

The coefficient of x7 in (x/2 – 3/x2)10 is

1.  405/256

2.  504/259

3.  450/263

4.  405/128

View Answer  
4
Correct Answer :

405/256


Explanation :
No Explanation available for this question

The term independent of x in (3x2/2 – 1/3x)9 is

1.  7/18

2.  5/18

3.  11/18

4.  13/18

View Answer  
4
Correct Answer :

7/18


Explanation :
No Explanation available for this question

In the binomial expansion (a-b)n,n≥5,the sum of 5th & 6th terms is zero then a/b=

1.  (n-4)/5

2.  5/(n-4)

3.  6/(n-5)

4.  (n-5)/6

View Answer  
4
Correct Answer :

(n-4)/5


Explanation :
No Explanation available for this question

The coefficient of Xn in the expansion of (1+x)(1-x)n is

1.  (n-1)(-1)n

2.  (-1)n-1(n+1)

3.  (-1)n-1(n-1)2

4.  (-1)n(1-n)

View Answer  
4
Correct Answer :

(-1)n(1-n)


Explanation :
No Explanation available for this question

The number of terms in the expansions of (x+y+z)n is

1.  n(n+1)/2

2.  (n+1)(n+2)/2

3.  n(n+3)/2

4.  (n+1)(n+3)/2

View Answer  
4
Correct Answer :

(n+1)(n+2)/2


Explanation :
No Explanation available for this question
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