# 1+ n/3+n(n+1)/3.6+n(n+1)(n+2)/3.6.9+............∞=

1.  (3/4)n

2.  (4/3)n

3.  (2/3)n

4.  (3/2)n

4

(3/2)n

Explanation :
No Explanation available for this question

# The locus of point of intersection of the two tangents to y2 = 4ax inclined at an angle 450 is

1.  x2 + y2 – 4ax + 2a2 =0

2.  x2 – y2 + 6ax + a2 =0

3.  x2 + y2 + 8ax + 4a2 =0

4.  x2 + y2 – 2ax + 4a2 =0

4

x2 – y2 + 6ax + a2 =0

Explanation :
No Explanation available for this question

# If C is very small when compared to K then (k/(k+c))(1/2)+(k/(k-c))(1/2)=

1.  2 –(3c2/4k2)

2.  2 + (3c2/4k2)

3.  2 –(c/k)

4.  2 +(c/k)

4

2 + (3c2/4k2)

Explanation :
No Explanation available for this question

# 5/3.6+5.7/3.6.9+5.7.9/3.6.9.12+...........∞=

1.  3√3 – 2

2.  1/3(√3 -2)

3.  1/3(3√3 -2)

4.  √3 -2

4

1/3(3√3 -2)

Explanation :
No Explanation available for this question

# The ordinate of the feet of three normals to the parabola y2 = 4ax from the point (6a, 0) are

1.  0, -3a, 3a

2.  0, -2a, 2a

3.  0, -4a, 4a

4.  0, -5a, 5a

4

0, -4a, 4a

Explanation :
No Explanation available for this question

# 2+ 5/(2!.3)+5.7/(3!.3)+5.7/(3!.32 )+...........∞=

1.  3√3-2

2.  1/3(√3-2)

3.  1/3(3√3-2)

4.  3√3-1

4

3√3-2

Explanation :
No Explanation available for this question

# The sub tangent, ordinate of the point, and subnormal to the parabola y2=12x at (4/3, 4) are in

1.  A.P.

2.  H.P.

3.  G.P.

4.  A.G.P

4

G.P.

Explanation :
No Explanation available for this question

# Coefficient of x4 in (1-3x)2/(1-2x) is

1.  2

2.  3

3.  4

4.  1

4

4

Explanation :
No Explanation available for this question

# y=x√2 – 4a√2 is a normal chord to y2 = 4ax, then its length is:

1.  8a√3

2.  4a√3

3.  6a√3

4.  2a√3

4

6a√3

Explanation :
No Explanation available for this question

# 5.C0+8.C1+11.C2+….to (n +1) terms=

1.  (3n + 10)2n-1

2.  (3n + 10)2n

3.  (3n + 5)2n-1

4.  (3n + 5)2n

4