1
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
Let A = $$\left[ {\matrix{ 1 & 0 & 0 \cr 1 & 1 & 0 \cr 1 & 1 & 1 \cr } } \right]$$ and B = A20. Then the sum of the elements of the first column of B is :
A
210
B
211
C
231
D
251
2
JEE Main 2018 (Online) 16th April Morning Slot
+4
-1
The number of values of k for which the system of linear equations,
(k + 2)x + 10y = k
kx + (k +3)y = k -1
has no solution, is :
A
1
B
2
C
3
D
infinitely many
3
JEE Main 2018 (Offline)
+4
-1
If $$\left| {\matrix{ {x - 4} & {2x} & {2x} \cr {2x} & {x - 4} & {2x} \cr {2x} & {2x} & {x - 4} \cr } } \right| = \left( {A + Bx} \right){\left( {x - A} \right)^2}$$

then the ordered pair (A, B) is equal to
A
(4, 5)
B
(-4, -5)
C
(-4, 3)
D
(-4, 5)
4
JEE Main 2018 (Offline)
+4
-1
If the system of linear equations

x + ky + 3z = 0
3x + ky - 2z = 0
2x + 4y - 3z = 0

has a non-zero solution (x, y, z), then $${{xz} \over {{y^2}}}$$ is equal to
A
30
B
-10
C
10
D
-30
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