# If 5x=(0.5)y=1000, then (1/x)-(1/y) is equal to

1.  1

2.  1/2

3.  1/3

4.   1/4

4

1/3

Explanation :
No Explanation available for this question

# The number of ways in which 13 gold coins can be distributed among three persons such that each one gets at least two gold coins is :

1.  6

2.  12

3.  24

4.  36

4

36

Explanation :
No Explanation available for this question

# The number of quadratic expressions with the coefficient drawn from the set (0, 1, 2, 3) is

1.  21

2.  36

3.  48

4.  64

4

21

Explanation :
No Explanation available for this question

1.  n/n+1

2.  n2/(n+1)2

3.  n4/(n+1)4

4.  n6/(n+1)6

4

n2/(n+1)2

Explanation :
No Explanation available for this question

# The coefficient of x-n in (1+x)n(1+(1/x))n is:

1.  0

2.  1

3.  2n

4.  2nCn

4

1

Explanation :
No Explanation available for this question

# If the coefficient of rth term and (r + l)th term in the expansion of (1 + x)20 are in the ratio 1 : 2, then r is equal to:

1.  6

2.  7

3.  8

4.  9

4

7

Explanation :
No Explanation available for this question

# If

1.  1

2.  2

3.  3

4.  4

4

3

Explanation :
No Explanation available for this question

# The locus of the Z in the argand plane for which |z+1|2+|z-1|2=4, is a

1.  straight line

2.  pair of straight lines

3.  circle

4.  parabola

4

circle

Explanation :
No Explanation available for this question

# If θ is real, the modulus ofis:

1.  1/2 sec θ/2

2.  1/2 cos θ/2

3.  sec θ/2

4.  cos θ/2

4

1/2 sec θ/2

Explanation :
No Explanation available for this question

# If 1, ω, ω2 are the roots of unity, then (a + b)3+(aω + bω2)3+(aω2+bω)3 is equal to:

1.  a3 + b3

2.  3(a3 + b3)

3.  a2 - b3

4.  a3 + b3 + 3ab

4