Q21. 
What is the remainder left after dividing $1!+2!+3!.....+100!$ by $7$? 
A.  0 

B.  5 

C.  14 

D.  21 
Q22. 
The highest power of 9 dividing 99! completely is 
A.  12 

B.  14 

C.  22 

D.  24 
Q25. 
It is given that $2^{32} + 1$ is exactly divisible by a certain number. Which one of the following is also divisible by the same number? 
A.  $2^{96} + 1$ 

B.  $2^{16} + 1$ 

C.  $2^{32} + 1$ 

D.  $2^{64} + 1$ 