Words of length 10 are formed using... | Permutation & Combination | JEE Advance

Competishun Header

JEE Advance 2017

Paper-1 2017

Question

Words of length 10 are formed using the letters $A, B, C, D, E, F, G, H, I, J$. Let $x$ be the number of such words where no letter is repeated ; and let $y$ be the number of such words where exactly one letter is repeated twice and no other letter is repeated. Then, $\frac{y}{9 x}=$

Write Your Answer

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution

Question Tags

JEE Advance

Mathematics

Easy

Start Preparing for JEE with Competishun

Video Solution

BY competishun

Watch Solution

YouTube

Filters 0

Showing 18 questions

QJEE Main 20242024

Consider the following reaction, the rate expression of which is given below
$...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

From 6.55 g of aniline, the maximum amount of acetanilide that can be prepared will be $\_\_\_\_$ $\times 10^{-1} \mathrm{~g}$.

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

Three moles of an ideal gas are compressed isothermally from 60 L to 20 L using constant pressure of 5...

JEE MainPhysicsEasy

View Solution→

QJEE Main 20242024

Number of compounds/species from the following with non-zero dipole moment is $\_\_\_\_$ $...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

The maximum number of orbitals which can identified with $\mathrm{n}=4$ and $\mathrm{m}_l=0$ is $\_\_\_\_$

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

The number of species from the following that have pyramidal geometry around the central atom is $\_\_\_\_$
$...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

The number of unpaired d-electrons in $\left[\mathrm{Co}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right]^{3+}$ is $\_\_\_\_$

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

A first row transition metal in its +2 oxidation state has a spin-only magnetic moment value of 3.86 BM. The...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

For a strong electrolyte, a plot of molar conductivity against (concentration) ${ }^{1 / 2}$ is a straight line, with...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

Given below are two statements:
Statement I : The correct order of first ionization enthalpy values of Li, Na, F...

JEE MainChemistryEasy

View Solution→

QJEE Main 20242024

Choose the Incorrect Statement about Dalton's Atomic Theory

JEE MainChemistryEasy

View Solution→

QJee Main 20242024

Let the slope of the line $45 x+5 y+3=0$ be $27 r_1+\frac{9 r_2}{2}$ for some $r_1, r_2 \in R$. Then...

JEE MainMathematicsEasy

View Solution→

QJee Main 20242024

Let the set $C=\left\{(x, y) \mid x^2-2^y=2023, x, y \in \mathbb{N}\right\}$. Then $\sum_{(x, y) \in C}(x+y)$ is equal to

JEE MainMathematicsMedium

View Solution→

QJee Main 20242024

Remainder when $64^{32^{32}}$ is divided by 9 is equal to

JEE MainMathematicsMedium

View Solution→

QJee Main 20242024

Let $f(x)=\sqrt{\lim _{r \rightarrow x}\left\{\frac{2 r^2\left[(f(r))^2-f(x) f(r)\right]}{r^2-x^2}-r^3 e^{\frac{f(r)}{r}}\right\}}$ be differentiable in $(-\infty, 0) \cup(0, \infty)$ and $f(1)=1$. Then the value...

JEE MainMathematicsHard

View Solution→

Q JEE MAIN 20242024

The number of symmetric relations defined on the set $\{1,2,3,4\}$ which are not reflexive is

JEE MainMathematicsEasy

View Solution→

QJee Main 20242024

Let $O$ be the origin, and $M$ and $N$ be the points on the lines $\frac{x-5}{4}=\frac{y-4}{1}=\frac{z-5}{3}$ and $\frac{x+8}{12}=\frac{y+2}{5}=\frac{z+11}{9}$ respectively such...

JEE MainMathematicsMedium

View Solution→

QJEE Main 20242024

Fuel cell, using hydrogen and oxygen as fuels,
A. has been used in spaceship
B. has as efficiency...

JEE MainChemistryEasy

View Solution→