The set of all real values of $\lambda$ for which the quadratic equation $\left( \lambda ^ { 2 } + 1 \right) x ^ { 2 } - 4 \lambda x + 2 = 0$ always have exactly one root in the interval $( 0,1 )$ is : (1) $( - 3 , - 1 )$ (2) $( 0,2 )$ (3) $( 1,3 ]$ (4) $( 2,4 ]$
If the term independent of $x$ in the expansion of $\left( \frac { 3 } { 2 } x ^ { 2 } - \frac { 1 } { 3 x } \right) ^ { 9 }$ is $k$, then $18k$ is equal to: (1) 11 (2) 5 (3) 9 (4) 7
Let the latus rectum of the parabola $y ^ { 2 } = 4 x$ be the common chord to the circles $C _ { 1 }$ and $C _ { 2 }$ each of them having radius $2 \sqrt { 5 }$. Then, the distance between the centres of the circles $C _ { 1 }$ and $C _ { 2 }$ is : (1) 12 (2) 8 (3) $8 \sqrt { 5 }$ (4) $4 \sqrt { 5 }$