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Combinatorics
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A box Contains 7 red and 6 green ball
July 24th, 2022
probability
combinatorics
Counting numbers of ways to reach from point A to B?
January 20th, 2023
combinatorics
What's the number of possible paths from $(0,0)$ to $(m,n)$ cell in a matrix?
August 20th, 2022
combinatorics
Probability of choosing two marbles of the same color?
January 6th, 2023
probability
contest-math
combinatorics
How many combinations out of 3 elements?
December 31st, 2022
combinatorics
combinations
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
combinatorics
permutations
How many ways of creating a PIN code with length of 6 are there?
December 24th, 2022
combinatorics
How to find closed-form expression of this series?
July 23rd, 2022
closed-form
combinatorics
generating-functions
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
combinations
combinatorics
permutations
Prove that isomorphic graphs have the same chromatic number and the same chromatic polynomial.
December 11th, 2022
graph-theory
coloring
combinatorics
How many 4-digit even numbers can be formed using digits 1,2,3,5 using each digit once?
December 8th, 2022
combinatorics
Derive an algorithm for computing the number of restricted passwords for the general case?
July 23rd, 2022
combinatorics
Counting permutations of $\{1,2,\ldots,n\}$ satisfying a certain condition
August 15th, 2022
combinatorics
Count the license plates possible with 4 letters and 2 digits
November 11th, 2022
combinatorics
algebra-precalculus
How many rectangles can be observed in the grid?
August 15th, 2022
combinations
discrete-mathematics
combinatorics
permutations
In how many ways could $15$ people be divided into groups?
October 17th, 2022
combinatorics
Probability of events after a random ball was moved from one box to another
August 14th, 2022
balls-in-bins
probability
combinatorics
How many four-digit numbers contain only the digits 1 and 2 and each of them at least once?
October 4th, 2022
combinatorics
Number of ways for 7 people to be seated so that two particular ones are separated by 3
October 2nd, 2022
combinations
combinatorics
Counting Principles. Numbers not divisible by $5$
September 22nd, 2022
combinatorics
Seat 5 men and 4 women in a row such that the women occupy even places
September 21st, 2022
permutations
combinatorics
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
combinatorics
How many different necklaces can be formed with $6$ white and $5$ red beads?
August 1st, 2022
combinatorics
Probability of increasing order of a $3$ rolls of a die.
August 1st, 2022
combinatorics
probability
dice
How many different ways can a group of students be hired to work a survey?
September 12th, 2020
permutations
combinatorics
statistics
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
probability
combinatorics
permutations
combinations
percentages
Combinatorics (Yahtzee)
August 1st, 2022
combinatorics
Project Euler's Problem Number 88
August 1st, 2022
algorithms
combinatorics
project-euler
computability
computational-complexity
Show that $(1+x)^n$ = .... Hence deduce that .... = $2^n$
August 21st, 2020
binomial-coefficients
combinations
combinatorics
proof-verification
In how many ways can you arrange all letters in the word MISSISSIPPI so that
October 6th, 2020
combinatorics
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