Combination with Replacement Calculator

Instructions:
  • Enter 'n' (total items) and 'r' (selection count).
  • Check "Allow Zero Selection" if needed.
  • Click "Calculate" to compute the result.
  • View the result and calculation details below.
  • Use "Calculation History" to track previous calculations.
  • Click "Clear" to reset the inputs and results.
  • Click "Copy Result" to copy the result to the clipboard.
Advanced Features
Result:


Calculation Details


Calculation History
Calculation Result

The Combination with Replacement Calculator is a tool that helps you calculate the number of possible combinations that can be obtained by taking a subset of items from a larger set. This calculator is useful when you need to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are allowed.

Concepts

Combinations

The number of ways to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are not allowed is called a combination. The formula for calculating the number of combinations is:

C(n,r) = n! / (r! * (n-r)!)

Combinations with Replacement

The number of ways to choose a sample of r elements from a set of n distinct objects where order does not matter and replacements are allowed is called a combination with replacement. The formula for calculating the number of combinations with replacement is:

CR(n,r) = (n + r – 1)! / (r! * (n – 1)!)

Factorial

The factorial of a non-negative integer n, denoted by n!, is the product of all positive integers less than or equal to n. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.

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Formulae

The formula for calculating the number of combinations with replacement is:

CR(n,r) = (n + r – 1)! / (r! * (n – 1)!)

Benefits

The Combination with Replacement Calculator has several benefits, including:

  • It saves time by quickly calculating the number of possible combinations.
  • It eliminates the need for manual calculations, which can be prone to errors.
  • It provides accurate results every time.

Interesting Facts

  • The Combination with Replacement Calculator is also known as the multichoose calculator.
  • The calculator can be used in various fields, including mathematics, statistics, and computer science.
  • The concept of combinations with replacement is used in probability theory and combinatorics.

Use Cases

The Combination with Replacement Calculator can be used in various scenarios, including:

  • In probability theory, it can be used to calculate the probability of an event occurring when there are multiple outcomes.
  • In computer science, it can be used to generate all possible combinations of characters in a password.
  • In statistics, it can be used to calculate the number of ways that a sample can be drawn from a population.
References

Here are some references that provide more information on combinations and binomial coefficients:

  • Kenneth H. Rosen: Discrete Mathematics and Its Applications, 8th Edition, McGraw-Hill Education, 2019
  • Susan S. Epp: Discrete Mathematics with Applications, 5th Edition, Cengage Learning, 2018
  • Thomas H. Cormen, Charles E. Leiserson, Ronald L. Rivest, and Clifford Stein: Introduction to Algorithms, 3rd Edition, MIT Press, 2009

Last Updated : 25 November, 2023

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