# A bag 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 a 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

4

8/15

Explanation :
No Explanation available for this question

# For a Poisson variate X,if P(X=2) = 3P(X=1) and P(X=2) = 0.3,then the mean of X is

1.  1

2.  1/2

3.  1/3

4.  1/4

4

1

Explanation :
No Explanation available for this question

# A random variate X takes the values 0,1,2,3 and its mean is 1.3.If P(X=3)=2P(X=1) and P(X=2)=0.3,then P(X=0) is equal to

1.  0.1

2.  0.2

3.  0.3

4.  0.4

4

0.4

Explanation :
No Explanation available for this question

# The co-ordinate axes are rotated through an angle 1350.If the co-ordinates of a point P in the new system are known to be (4,-3),then the co-ordinates of p in the original system are

1.  (1/√2,7/√2)

2.  (1/√2,-7/√2)

3.  (-1/√2,-7/√2)

4.  (-1/√2,7/√2)

4

(-1/&#8730;2,7/&#8730;2)

Explanation :
No Explanation available for this question

# The point P is equidistant from A(1,3),B(-3,5) and C(5,-1),then PA is equal to

1.  5

2.  5√5

3.  25

4.  5√10

4

5&#8730;10

Explanation :
No Explanation available for this question

# If the lines 4x+3y-1=0,x-y+5=0 and kx+5y-3=0 are concurrent,then k is equal to

1.  4

2.  5

3.  6

4.  7

4

6

Explanation :
No Explanation available for this question

# If the pair of straight lines given by Ax2+2Hxy+By2=0 (H2>AB) forms an equilateral triangle with line ax+by+c=0,then (A+3B)(3A+B) is equal to

1.  H2

2.  -H2

3.  2H2

4.  4H2

4

4H<sup>2</sup>

Explanation :
No Explanation available for this question

# The area (in square units) of the quadrilateral formed by two pairs of lines λ2x2-m2y2-n(λx+my)=0 and λ

1.  n2/(2|λm|)

2.  n2/(|λm|)

3.  n/(2|λm|)

4.  n2/(4|λm|)

4

n<sup>2</sup>/(2|&#955;m|)

Explanation :
No Explanation available for this question

# If f(x) = x2/(x+a), then f"(a) is equal to:

1.  4a

2.  1/8a

3.  1/4a

4.  8a

4

1/4a

Explanation :
No Explanation available for this question

1.  3 : 7

2.  2 : 7

3.  -3 : 7

4.  -2 : 7

4