Functions · Mathematics · IAT (IISER)
MCQ (Single Correct Answer)
1
Let $[x]$ denote the greatest integer less than or equal to $x$. The number of positive integer solutions of the equation
$$ \left[\frac{x}{19}\right]=\left[\frac{x}{20}\right] $$
are:
IAT (IISER) 2020
2
Let $f: \mathbb{R} \rightarrow \mathbb{R}$ and $g: \mathbb{R} \rightarrow \mathbb{R}$ be two functions such that
$$ g \circ f(x)= \begin{cases}x^2, & \text { if } x \geq 0 \\ e^x-1, & \text { if } x<0\end{cases} $$
Then which of the following statements is correct?
IAT (IISER) 2020
3
For what value of $t$ does $f(x)=x^3+t x^2+(2-t) x-3$ have only real roots?
IAT (IISER) 2020