Q16. 
Find the remainder when $3^{164}$ is divided by $162$? 
A.  0 

B.  9 

C.  11 

D.  81 
Q17. 
The two positive integers '$p$' and '$q$' satisfy: $dfrac{(p+q)}{t} = text{HCF}(p,q)$. Which of the following two numbers sum up to '$t$'? 
A.  13 and 52 

B.  132 and 96 

C.  18 and 126 

D.  56 and 45 
Q18. 
Which one of the following is the minimum value of the sum of two integers whose product is 36? 
A.  37 

B.  20 

C.  15 

D.  12 
Q19. 
What is the remainder when $9^1 + 9^2 + 9^3 + .... + 9^8$ is divided by $6$? 
A.  3 

B.  2 

C.  0 

D.  5 
Q20. 
What is the unit's digit of the number $6^{256} – 4^{256}$ 
A.  0 

B.  1 

C.  4 

D.  7 