New post in Combinatorics

A box Contains 7 red and 6 green ball

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

How to find closed-form expression of this series?

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

Derive an algorithm for computing the number of restricted passwords for the general case?

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

In how many ways can $4$ boys and $3$ girls be arranged in a row so that no two girls are together?

August 1st, 2022

How many different necklaces can be formed with $6$ white and $5$ red beads?

August 1st, 2022

Probability of increasing order of a $3$ rolls of a die.

August 1st, 2022

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

September 12th, 2020

A team won 80% of the games it played 5 more games of which it won 3 and lost 2. Its loss percentage changed to 25% how many games it play overall?

August 1st, 2022

Combinatorics (Yahtzee)

August 1st, 2022

Project Euler's Problem Number 88

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