Let $\dfrac{1}{x_1},\dfrac{1}{x_2},\ldots,\dfrac{1}{x_n}$ $(x_i\ne0\text{ for }i=1,2,\ldots,n)$ be in A.P. such that $x_1=4$ and $x_{21}=20$. If $n$ is the least positive integer for which $x_n>50$, then $\displaystyle\sum_{i=1}^n \left(\dfrac{1}{x_i}\right)$ is equal to :

1

Let $M$ and $m$ be respectively the absolute maximum and the absolute minimum values of the function $f(x) = 2x^{3} - 9…

Topic: JEE Main 2018 (16 April Morning Shift)

2

If the function $f$ defined as $f(x) = \dfrac{1}{x} - \dfrac{kx - 1}{e^{2x} - 1}, ; x \ne 0$, is continuous at $x = 0$,…

Topic: JEE Main 2018 (16 April Morning Shift)

3

Let A = $\left[ {\matrix{ 1 & 0 & 0 \cr 1 & 1 & 0 \cr 1 & 1 & 1 \cr } } \right…

Topic: JEE Main 2018 (16 April Morning Shift)

4

If $x = \sqrt{2^{\csc^{-1} t}}$ and $y = \sqrt{2^{\sec^{-1} t}}$ $(\lvert t \rvert \ge 1)$, then $\dfrac{dy}{dx}$ is eq…

Topic: JEE Main 2018 (16 April Morning Shift)

5

If $\displaystyle \int \frac{\tan x}{1+\tan x+\tan^{2}x},dx = x - \frac{K}{\sqrt{A}}\tan^{-1}\left(\frac{K\tan x + 1}{\…

Topic: JEE Main 2018 (16 April Morning Shift)

6

If $f(x) = \displaystyle\int_{0}^{x} t(\sin x - \sin t),dt$ then :

Topic: JEE Main 2018 (16 April Morning Shift)

1

$\displaystyle\lim_{x\to0} \dfrac{(27+x)^{1/3}-3}{9-(27+x)^{2/3}}$ equals :

Topic: JEE Main 2018 (16 April Morning Shift)

2

The number of numbers between $2000$ and $5000$ that can be formed with the digits $0,1,2,3,4$ (repetition of digits is…

Topic: JEE Main 2018 (16 April Morning Shift)

3

If $\displaystyle \int \frac{\tan x}{1+\tan x+\tan^2 x},dx = x - \frac{K}{\sqrt{A}}\tan^{-1}!\left(\frac{K\tan x + 1}{\…

Topic: JEE Main 2018 (16 April Morning Shift)

4

Let $M$ and $m$ be respectively the absolute maximum and the absolute minimum values of the function $f(x)=2x^{3}-9x^{2…

Topic: JEE Main 2018 (16 April Morning Shift)

5

If the function $f$ defined as $f(x)=\dfrac{1}{x}-\dfrac{kx-1}{e^{2x}-1},\ x\ne0$, is continuous at $x=0$, then the ord…

Topic: JEE Main 2018 (16 April Morning Shift)

6

Let $p, q$ and $r$ be real numbers $(p \ne q,, r \ne 0)$, such that the roots of the equation $\dfrac{1}{x+p} + \dfrac{…

Topic: JEE Main 2018 (16 April Morning Shift)

7

The least positive integer $n$ for which $\left(\dfrac{1 + i\sqrt{3}}{1 - i\sqrt{3}}\right)^{n} = 1$ is:

Topic: JEE Main 2018 (16 April Morning Shift)

8

Let $\mathbb{N}$ denote the set of all natural numbers. Define two binary relations on $\mathbb{N}$ as $R_1 = {(x,y) \i…

Topic: JEE Main 2018 (16 April Morning Shift)

9

Two different families $A$ and $B$ are blessed with equal number of children. There are $3$ tickets to be distributed a…

Topic: JEE Main 2018 (16 April Morning Shift)

10

If an angle $A$ of $\triangle ABC$ satisfies $5\cos A + 3 = 0$, then the roots of the quadratic equation $9x^{2} + 27x …

Topic: JEE Main 2018 (16 April Morning Shift)