# The focus and directrix of a parabola are (1, 2) and 2x – 3y + 1=0. Then the equation of the tangent at the vertex is

1.  4x – 6y + 5=0

2.  4x – 6y + 9=0

3.  4x – 6y + 11=0

4.  4x – 6y + 7=0

4

4x – 6y + 5=0

Explanation :
No Explanation available for this question

# If (9, 12) is one end of a double ordinate of the parabola y2=16x then its equation is

1.  x + 9=0

2.  y + 9=0

3.  y – 9= 0

4.  x – 9 =0

4

x – 9 =0

Explanation :
No Explanation available for this question

# If z=1/3+1.3/2.6+1.3.5/1.2.3+..........∞,then

1.  Z2+2z+2=0

2.  Z2+2z-2=0

3.  Z2-2z-2=0

4.  Z2-2z+2=0

4

Z2+2z+2=0

Explanation :
No Explanation available for this question

# Equation of the directrix of the parabola y2=5x – 4y – 9 is

1.  2x + 1 =0

2.  4x + 1=0

3.  6x + 1=0

4.  4x – 1=0

4

4x + 1=0

Explanation :
No Explanation available for this question

# 4th term of (1-2x/3)(3/4) is:

1.  -5π3/432

2.  5π3/432

3.  -5π3/72

4.  5π3/72

4

3/432

Explanation :
No Explanation available for this question

# Equation of the latusrectum of the parabola x2 + 8x + 12y + 4=0 is

1.  y + 3=0

2.  y + 2=0

3.  y + 1=0

4.  y + 5=0

4

y + 2=0

Explanation :
No Explanation available for this question

# 3/6+3.5/6.9+3.5.7/6.9.12+...........∞

1.  2√3

2.  3√3-4

3.  3√3 - 4

4.  3√3

4

3√3-4

Explanation :
No Explanation available for this question

# In the expansion of (1-x2)/(1-2x)2coefficient of x7 is

1.  1024

2.  832

3.  96

4.  128

4

832

Explanation :
No Explanation available for this question

# In the expansion of (1 + x + x2+………∞)3, the coefficient of xn is

1.  (n +2)(n +3)/2

2.  n(n-1)/2

3.  (n +1)(n +2)/2

4.  n(n+1)/2

4

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

Explanation :
No Explanation available for this question

1.  38

2.  37

3.  36

4.  35

4