# If 1,ω,ω2 are the cube roots of unity, then (a+bω+cω2)/ (c+aω+bω2) is equal to:

1.  1

2.  ω

3.  ω2

4.  ω3

4

ω2

Explanation :
No Explanation available for this question

# If cos A+cos B+cos C =0 and A+B+C =1800,then value of cos3A+cos3B+cos3C is

1.  3

2.  -3

3.  4cosAcosBcosC

4.  12 cosAcosBcosC

4

-3

Explanation :
No Explanation available for this question

# The value of cos(2π/15)cos(4π/15)cos(8π/15)cos(14π/15) is

1.  1/8

2.  1/12

3.  1/16

4.  3/4

4

1/16

Explanation :
No Explanation available for this question

# θ is an acute angle and tanθ =1/√7,then the value of is

1.  3/4

2.  1/2

3.  2

4.  5/4

4

3/4

Explanation :
No Explanation available for this question

# The probability that A can solve problem is 2/3 and that B can solve it is 3/4.What is the probability that the problem is solved

1.  11/12

2.  7/12

3.  5/12

4.  9/12

4

11/12

Explanation :
No Explanation available for this question

# Six coins are tossed simultaneously the probability of getting at least 4 tails,is

1.  11/64

2.  21/32

3.  11/32

4.  15/44

4

11/32

Explanation :
No Explanation available for this question

# If a random variable X has a Poission distribution such that P(X=1),P(X=2) its mean and variance are

1.  1,1

2.  2,2

3.  2,√3

4.  2,4

4

2,2

Explanation :
No Explanation available for this question

# If X has a Poission distribution ,the variance is 'm'.The sum of the terms in odd places in this distribution is

1.  e-m

2.  e-m cosh m

3.  e-m sinh m

4.  e-m coth m

4

e<sup>-m</sup> sinh m

Explanation :
No Explanation available for this question

# The probability that a candidate secure a seat in engineering through 'EAMCET' is 1/10.7 candidates are Selected from a center. The probability that exactly two will get success, is

1.  15(0.1)2(0.9)2

2.  20(0.1)2(0.9)2

3.  21(0.1)2(0.9)5

4.  none of these

4

none of these

Explanation :
No Explanation available for this question

1.  1/8,22,27

2.  1/8,23/27

3.  1/8,24/27

4.  1/8,3/4

4