A.\(1.\)              
B.\(3.\)                    
C.\(4.\)               
D.\( - 2.\)

A.\(\left( { - \infty ; - 1} \right).\)             
B.\(\left( {0;1} \right).\)   
C.\(\left( { - 1;0} \right).\)     
D.\(\left( { - \infty ;0} \right).\)

A.\(\frac{{32\pi }}{3}.\)  
B.\(8\pi .\)              
C.\(16\pi .\)                  
D.\(4\pi .\)

A.
B.
C.
D.

A.
B.
C.
D.

A.\(C_{10}^2.\)      
B.\(A_{10}^2\)       
C.\({10^2}.\)             
D.\({2^{10}}.\)

A.\(6.\)                
B.\(3.\)                
C.\(12.\)                    
D.\( - 6.\)

A.\(x = 4\).              
B.\(x = 3.\)                   
C.\(x = 2.\)          
D.\(x = 1.\)

A.\(6\).                         
B.\(8.\)                             
C.\(4.\)                   
D.\(2.\)

A.\(\left[ {0; + \infty ).} \right.\)          
B.\(\left( { - \infty ; + \infty } \right).\)   
C.\(\left( {0; + \infty } \right).\)          
D.\(\left[ {2; + \infty ).} \right.\)