Question 1 :
On a vertical number line positive numbers are placed ____ $0$

Question 2 :
The number of surjections from $A = {1, 2,.....n}, n \leq 2$, onto B = {a, b} is

Question 4 :
$n^2+n+1$ is a or an ______ number for all $n\in N$

Question 5 :
What is the multiplicative identity element in the set of whole numbers?

Question 7 :
The given below input rearranges step-by-step in particular order according to a set of rules. In this case the last step of arranged input is Step V.<br/>Input : &#160;85 16 36 04 19 97 63 09&#160;<br/>Step I : &#160;97 85 16 36 04 19 63 09<br/>Step II : 97 85 63 16 36 04 19 09<br/>Step III : 97 85 63 36 16 04 19 09<br/>Step IV : 97 85 63 36 19 16 04 09<br/>Step V : 97 85 63 36 19 16 09 04<br/>Study the above arrangement carefully and then answer the following question.<br/>Which of the following will be step III for their input below?<br/>Input : 09 25 16 30 32 18 17 06<br/><br/>

Question 8 :
If $(31 + 15) + x = 31 + (15 + 23)$, then by using associativity of addition $x= $