# (1/1.3)+(1/2.5)+(1/3.7)+(1/4.9)+……..=

1.  2loge2-2

2.  2-2loge2

3.  2loge4

4.  loge4

4

2-2loge2

Explanation :
No Explanation available for this question

# Five horses are in a race. Mr.A selects two of the horses at random and bets on them. The probability that Mr. A selected the winning horse is

1.  3/5

2.  1/5

3.  2/5

4.  4/5

4

2/5

Explanation :
No Explanation available for this question

# A letter is known to have come from TATANAGAR or CALCUTTA. On the envelope just two consecutive letters TA are visible. The probability that the letter has come from CALCUTTA is

1.  4/11

2.  7/11

3.  1/22

4.  21/22

4

4/11

Explanation :
No Explanation available for this question

# Out of (2n+1) tickets consecutively numbered, three are drawn at random. The chance that the numbers on them are in A.P. is

1.  n/(n2-1)

2.  3n/(n2-1)

3.  3n/(4n2-1)

4.  3n/(4n2+2n-1)

4

3n/(4n2-1)

Explanation :
No Explanation available for this question

# If X is a random variable with the following probability distribution given below X=x

1.  1/8, 22/27

2.  1/8, 23/27

3.  1/8, 24/27

4.  1/8, 27/36

4

1/8, 27/36

Explanation :
No Explanation available for this question

# A random variable X has its range X={3,2,1} with the probabilities 1/2, 1/3 and 1/6 respectively. The mean value of X is

1.  5/3

2.  7/3

3.  3

4.  4

4

7/3

Explanation :
No Explanation available for this question

# A random variable X has its range X={0,1,2} and the probabilities are given by p(x=0)=3k2, p(X=1)=4k-10k2, p(X=2)=5k-1 where k is a constant, p(0

1.  3/49

2.  27/49

3.  37/49

4.  47/49

4

37/49

Explanation :
No Explanation available for this question

# A box contains 6 tickets. Two of the tickets carry a prize of Rs. 5/-each, the other four a prize of Rs. 1/- if one ticket is drawn. The mean value of prize is

1.  Rs. 2.5

2.  Rs. 7/3

3.  Rs. 5/3

4.  Rs. 4/3

4

Rs. 7/3

Explanation :
No Explanation available for this question

# If the variance of the random variable X is 9, the S.D. of the random variable -4X+8 is

1.  144

2.  27

3.  12

4.  16

4

12

Explanation :
No Explanation available for this question

1.  1/P(B)

2.  1/(1-P(B))

3.  P(A)/P(B)

4.  P(A)/(1-P(B)

4