A.\(\left( {2; + \infty } \right)\)
B.\(\left( {\dfrac{1}{2}; + \infty } \right)\)
C.\(\left( {0;2} \right)\)
D.\(\left( {0;\dfrac{1}{2}} \right)\)

A.\(3\)
B.\(0\)
C.\(1\)
D.\(2\)

A.\(7!\)
B.\(C_7^4\)
C.\(A_7^4\)
D.\({7^4}\)

A.\(41\)
B.\(\dfrac{{245}}{6}\)
C.\(\dfrac{{245}}{{12}}\)
D.\(\dfrac{{41}}{2}\)

A.\(2\)
B.\(4\)
C.\(5\)
D.\(3\)

A.\(3{\log _2}a\)
B.\(3 + {\log _2}a\)
C.\({\left( {{{\log }_2}a} \right)^3}\)
D.\(\dfrac{1}{3} + {\log _2}a\)

A.\(30\)
B.\(210\)
C.\(42\)
D.\(35\)

A.\(7\)
B.\(6\)
C.\(8\)
D.\(2021\)

A.\(1\)
B.\( - 1\)
C.\(0\)
D.\(3\)

A.\(1\)
B.\(\dfrac{{\sqrt 2 }}{2}\)
C.\(\dfrac{{\sqrt 5 }}{5}\)
D.\(\dfrac{{\sqrt {10} }}{2}\)