If a, a + 2, and a + 4 are prime numbers, then the number of possible solutions for a is:

1.  One

2.  Two

3.  Three

4.  More than Three

View Answer  
4
Correct Answer :

One


Explanation :
No Explanation available for this question

Let x and _y be positive integers such that x is prime and y is composite. Then,

1.  y - x cannot be an even integer

2.  xy cannot be an even integer

3.  (jc + y) cannot be an even integer

4.  None of the above statement is true

View Answer  
4
Correct Answer :

None of the above statement is true


Explanation :
No Explanation available for this question

A group of investigators took a fair sample of 1972 children from the general population and found that there are 1000 boys and 972 girls. If the investigators claim that their research is so accurate that the sex of a new bom child can be predicted based on the ratio of the sample of the population, then what is the expecta­tion in terms of the probability that a new child bom will be a girl

1.  243/250   

2.  250/257  

3.  9/10  

4.  243/493.

View Answer  
4
Correct Answer :

243/493.


Explanation :
No Explanation available for this question

A bag contains 3 red, 6 white and 7 black balls. Two bails are drawn at fandom. What is the probability that both are black

1.  1/8  

2.  7/40  

3.  12/40  

4.  13/40.

View Answer  
4
Correct Answer :

7/40

 


Explanation :
No Explanation available for this question

Let n (>1) be a composite natural number such that the square root of n is not an integer. Consider the follow­ing statements: A: n has a factor which is greater than 1 and less than square root n B: n has a factor which is greater than square root n but less than n "Then

1.  Both A and B are false

2.  Both A and b are true

3.  A is false but B is true

4.  Both A and B are true

View Answer  
4
Correct Answer :

Both A and b are true


Explanation :
No Explanation available for this question

A bag contains 6 red, 4 white and 8 blue balls. If three balls are drawn at random, find the probability that all the three balls are of the same colour.

1.  17/240  

2.  5/51

3.  31/204  

4.  None of these.

View Answer  
4
Correct Answer :

5/51


Explanation :
No Explanation available for this question

What is the remainder when 496 is divided by 6

1.  0

2.  2

3.  3

4.  4

View Answer  
4
Correct Answer :

4


Explanation :
No Explanation available for this question

What is the sum of all two-digit numbers that give a remainder of 3 when they are divided by 7

1.  646

2.  676

3.  683

4.  797

View Answer  
4
Correct Answer :

676


Explanation :
No Explanation available for this question

How many three digit positive integer, with digits x, y and z in the hundred's, ten's and unit's place respec­tively, exist such that x < y, z< y and x 0

1.  245

2.  285

3.  240

4.  320

View Answer  
4
Correct Answer :

240


Explanation :
No Explanation available for this question

How many even integers n, where 100 < n< 200, are divisible neither by seven nor by nine

1.  40

2.  37

3.  39

4.  38

View Answer  
4
Correct Answer :

39


Explanation :
No Explanation available for this question
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