A.\(\dfrac{{7!}}{{3!}}\)
B.\(A_7^3\)
C.21
D.\(C_7^3\)

A.9
B.4
C.36
D.\(\dfrac{1}{4}\)

A.\(\int\limits_2^9 {f\left( x \right)dx =  - 1} \)
B.\(\int\limits_2^9 {f\left( x \right)dx = 20} \)
C.\(\int\limits_2^9 {f\left( x \right)dx =9 } \)
D.\(\int\limits_2^9 {f\left( x \right)dx = 1} \)

A.\(z = 1 + 2i\)
B.\(z = 2 + i\)
C.\(z = 1 - 2i\)
D.\(z =  - 2 + i\)

A.\(y =  - \dfrac{1}{4}\)
B.\(x =  - 1\)
C.\(y = \dfrac{1}{2}\)
D.\(x = 2\)

A.\(2\pi r\sqrt {{h^2} + {r^2}} \)
B.\(\dfrac{1}{3}\pi {r^2}h\)
C.\(\pi {r^2}h\)
D.\(\pi r\sqrt {{h^2} + {r^2}} \)

A.\(\overrightarrow {{u_1}}  = \left( {0;3; - 1} \right)\)
B.\(\overrightarrow {{u_4}}  = \left( {1;2;5} \right)\)
C.\(\overrightarrow {{u_2}}  = \left( {1;3; - 1} \right)\)
D.\(\overrightarrow {{u_3}}  = \left( {1; - 3; - 1} \right)\)

A.\(\overrightarrow n  = \left( { - 2;1;3} \right)\)
B.\(\overrightarrow n  = \left( {2; - 1;3} \right)\)
C.\(\overrightarrow n  = \left( {2;1; - 3} \right)\)
D.\(\overrightarrow n  = \left( {2;1;3} \right)\)

A.\(\overline z  = 7 + 4i\)
B.\(\overline z  =  - 3 - 4i\)
C.\(\overline z  = 3 - 4i\)
D.\(\overline z  =  - 3 + 4i\)

A.\(\left| z \right| = 5\)
B.\(\left| z \right| = 3\)
C.\(\left| z \right| = 2\)
D.\(\left| z \right| = \sqrt 5 \)