A.5   
B.3    
C.7    
D.9

A.\(\dfrac{{10\pi {a^3}}}{9}\)
B.\(\dfrac{{5\pi {a^3}}}{2}\)
C.\(\dfrac{{\pi {a^3}}}{3}\)
D.\(\dfrac{{10\pi {a^3}}}{7}\)

A.\(\dfrac{{16\sqrt {11} }}{3}\)  
B.\(\dfrac{{5\sqrt {11} }}{3}\)   
C.\(\dfrac{{64\sqrt {11} }}{3}\)   
D.\(\dfrac{{32\sqrt {11} }}{3}\)

A.\(P = \sqrt {ab} \)
B.\(P = \dfrac{1}{{\sqrt[4]{{ab}}}}\)
C.\(P = \sqrt[4]{{ab}}\)
D.\(P =  - \sqrt[4]{{ab}}\)

A.\(\dfrac{{x - 1}}{1} = \dfrac{{y - 2}}{3} = \dfrac{{z + 2}}{1}\)   
B.\(\dfrac{x}{{ - 1}} = \dfrac{{y - 1}}{{ - 1}} = \dfrac{{z - 3}}{5}\)
C.\(\dfrac{{x + 1}}{1} = \dfrac{{y + 2}}{3} = \dfrac{{z - 2}}{1}\)   
D.\(\dfrac{{x + 1}}{1} = \dfrac{{y + 1}}{2} = \dfrac{{z - 5}}{{ - 2}}\)

A.\(672\)  
B.\(483\)   
C.\(3.\left( {{2^{21}} - 1} \right)\)   
D.\({3^{21}} - 1\)

A.\(P = \dfrac{{\sqrt {10} }}{2}\)  
B.\(P = 2\sqrt {10} \)   
C.\(P = \sqrt {10} \)   
D.\(P = 2\)

A.\(2 - \sqrt 2 \)  
B.\(1\)    
C.\(2 + \sqrt 2 \)   
D.\(2\)

A.\(I = \int\limits_1^3 {{t^2}dt} \)  
B.\(I = \int\limits_1^3 {tdt} \)   
C.\(I = \int\limits_1^{{e^4}} {{t^2}dt} \)   
D.\(I = 2\int\limits_1^3 {{t^2}dt} \)

A.\({45^o}\)
B.\({90^o}\)
C.\({30^o}\)
D.\({60^o}\)