A.\(a < 0,\,\,b > 0,\,\,c > 0,\,\,d > 0\)
B.\(a < 0,\,\,b < 0,\,\,c = 0,\,\,d > 0\)
C.\(a < 0,\,\,b > 0,\,\,c = 0,\,\,d > 0\)
D.\(a > 0,\,\,b < 0,\,\,c > 0,\,\,d > 0\)

A.\(16C_{21}^4\)
B.\( - 16C_{21}^4\)
C.\(8C_{21}^3{x^{12}}\)
D.\( - 8C_{21}^3\)

A.\(10\)
B.\(5\)
C.\(7\)
D.\(8\)

A.\({S_{xq}} = 20\pi \,\,c{m^2}\)
B.\({S_{xq}} = 15\pi \,\,c{m^2}\)
C.\({S_{xq}} = 24\pi \,\,c{m^2}\)
D.\({S_{xq}} = 12\pi \,\,c{m^2}\)

A.\(2x + y + 2z - 2 = 0\)
B.\(2x + 2y + 3z - 5 = 0\)
C.\(4x - y + z + 2 = 0\)
D.\(5x - y + 2z + 1 = 0\)

A.\({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z + 2} \right)^2} = 9\)
B.\({\left( {x + 1} \right)^2} + {\left( {y - 3} \right)^2} + {\left( {z + 2} \right)^2} = 3\)
C.\({\left( {x - 1} \right)^2} + {\left( {y + 3} \right)^2} + {\left( {z - 2} \right)^2} = 3\)
D.\({\left( {x - 1} \right)^2} + {\left( {y + 3} \right)^2} + {\left( {z - 2} \right)^2} = 9\)

A.\(27\pi \)
B.\(64\pi \)
C.\(32\pi \)
D.\(216\pi \)

A.\(S = 36\)
B.\(S = 45\)
C.\(S = 35\)
D.\(S = 44\)

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

A.\(0,45\)
B.\(\left( {Oxz} \right)\)
C.\(0,35\)
D.\(0,55\)