# New post in Combinatorics

July 24th, 2022

## Counting numbers of ways to reach from point A to B?

January 20th, 2023

## What's the number of possible paths from \$(0,0)\$ to \$(m,n)\$ cell in a matrix?

August 20th, 2022

## Probability of choosing two marbles of the same color?

January 6th, 2023

## How many combinations out of 3 elements?

December 31st, 2022

## Find the number of ways to arrange all the letters in the word “MALAYSIA” if the first letter must be a consonant and the last letter must be a vowel.

August 19th, 2022

## How many ways of creating a PIN code with length of 6 are there?

December 24th, 2022

July 23rd, 2022

## How many three-digit numbers formed from the six digits \$2\$, \$3\$, \$5\$, \$6\$, \$7\$, and \$9\$ without repetition are multiples of 5?

December 16th, 2022

## Prove that isomorphic graphs have the same chromatic number and the same chromatic polynomial.

December 11th, 2022

## How many 4-digit even numbers can be formed using digits 1,2,3,5 using each digit once?

December 8th, 2022

July 23rd, 2022

## Counting permutations of \$\{1,2,\ldots,n\}\$ satisfying a certain condition

August 15th, 2022

## Count the license plates possible with 4 letters and 2 digits

November 11th, 2022

## How many rectangles can be observed in the grid?

August 15th, 2022

## In how many ways could \$15\$ people be divided into groups?

October 17th, 2022

## Probability of events after a random ball was moved from one box to another

August 14th, 2022

## How many four-digit numbers contain only the digits 1 and 2 and each of them at least once?

October 4th, 2022

## Number of ways for 7 people to be seated so that two particular ones are separated by 3

October 2nd, 2022

## Counting Principles. Numbers not divisible by \$5\$

September 22nd, 2022

## Seat 5 men and 4 women in a row such that the women occupy even places

September 21st, 2022

August 1st, 2022

August 1st, 2022

August 1st, 2022

## How many different ways can a group of students be hired to work a survey?

September 12th, 2020

August 1st, 2022

August 1st, 2022

August 1st, 2022

## Show that \$(1+x)^n\$ = .... Hence deduce that .... = \$2^n\$

August 21st, 2020

## In how many ways can you arrange all letters in the word MISSISSIPPI so that

October 6th, 2020