The mean and variance of a set of $15$ numbers are $12$ and $14$ respectively. The mean and variance of another set of $15$ numbers are $14$ and $\sigma^{2}$ respectively. If the variance of all the $30$ numbers in the two sets is $13$, then $\sigma^{2}$ is equal to:
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One vertex of a rectangular parallelepiped is at the origin $O$ and the lengths of its edges along the $x$, $y$ and $z$…
Topic: JEE Main 2023 (6 April Morning Shift)
The straight lines $l_1$ and $l_2$ pass through the origin and trisect the line segment of the line
$L : 9x + 5y = 45…
Topic: JEE Main 2023 (6 April Morning Shift)
If the system of equations
$x + y + a z = b$
$2x + 5y + 2z = 6$
$x + 2y + 3z = 3$
has infinitely many solut…
Topic: JEE Main 2023 (6 April Morning Shift)
Let $A = \{x \in \mathbb{R} : [x + 3] + [x + 4] \le 3\}$,
and $B = \left\{ x \in \mathbb{R} : 3^x \left( \sum_{r=1}^{\…
Topic: JEE Main 2023 (6 April Morning Shift)
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Let $A = [a_{ij}]_{2\times 2}$, where $a_{ij}\ne 0$ for all $i,j$ and $A^{2}=I$.
Let $a$ be the sum of all diagonal e…
Topic: JEE Main 2023 (6 April Morning Shift)
Let $5f(x)+4f\!\left(\dfrac{1}{x}\right)=\dfrac{1}{x}+3,\; x>0.$
Then $18\displaystyle\int_{1}^{2} f(x)\,dx$ is equal…
Topic: JEE Main 2023 (6 April Morning Shift)
Let $I(x)=\displaystyle \int \frac{x^{2}\big(x\sec^{2}x+\tan x\big)}{(x\tan x+1)^{2}}\,dx.$
If $I(0)=0$, then $I\!\le…
Topic: JEE Main 2023 (6 April Morning Shift)
Let $\vec{a}=2\hat{i}+3\hat{j}+4\hat{k}$, $\vec{b}=\hat{i}-2\hat{j}-2\hat{k}$ and $\vec{c}=-\hat{i}+4\hat{j}+3\hat{k}$.…
Topic: JEE Main 2023 (6 April Morning Shift)
Let $a_{1},a_{2},a_{3},\ldots,a_{n}$ be $n$ positive consecutive terms of an arithmetic progression.
If $d>0$ is its …
Topic: JEE Main 2023 (6 April Morning Shift)
The sum of all the roots of the equation $\lvert x^{2}-8x+15\rvert-2x+7=0$ is:
Topic: JEE Main 2023 (6 April Morning Shift)
If the ratio of the fifth term from the beginning to the fifth term from the end in the expansion of
$\left(\sqrt[4]{2…
Topic: JEE Main 2023 (6 April Morning Shift)
If $2x^{y}+3y^{x}=20$, then $\dfrac{dy}{dx}$ at $(2,2)$ is equal to:
Topic: JEE Main 2023 (6 April Morning Shift)
Let the area of the region enclosed by the curves $y=3x$, $2y=27-3x$ and $y=3x-x\sqrt{x}$ be $A$. Then $10A$ is:
Topic: JEE Main 2023 (6 April Morning Shift)
