# Combination with repetition Calculator

## Calculates the number of combinations with repetition of n things taken r at a time.

 number of things n n≧r≧0 number to be taken r 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit combinations n+r-1Cr with repetition
 $\normal Combinations\ with\ repetition\\\vspace{5}(1)\ {}_{n+r-1}C_r={\large\frac{(n+r-1)!}{r!(n-1)!}}\\$

Combination with repetition
 [1-10] /12 Disp-Num5103050100200
[1]  2019/02/07 13:37   Male / Under 20 years old / High-school/ University/ Grad student / Very /
Purpose of use
clarification
Comment/Request
[2]  2018/04/14 08:52   Male / 60 years old level or over / A retired people / Not at All /
Purpose of use
help
Comment/Request
locked out of my bathroom and the lock has 3 number combination this wont tell me the combination even i tried everything this offers
[3]  2017/11/12 04:43   Male / 30 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
something snot right
Comment/Request
sorrry - i have made a mistake.
1296 combination
6 numbers, 4 rows
[4]  2017/11/12 04:40   Male / 30 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
something not wright
Comment/Request
I ha padlock wit 6 numbers in 4 possible combinations.
i put in excel every combination (one by one, put every single combination with "duplicate values" turned ON) possible and I get 1080 different combinations. In this calculator I get 126 which is not correct. Why?
[5]  2017/01/09 21:47   Male / 40 years old level / Self-employed people / Very /
Purpose of use
Study
Comment/Request
Can you increase the number of digit in combination calculator I am dealing with big number and I need the precise number of combination the maximum of available digit to display result is 50 digit can you increase that
Your calculator is awesome helped me a lot thanks
[6]  2016/02/25 04:41   Female / Under 20 years old / High-school/ University/ Grad student / A little /
Purpose of use
Maths homework
Comment/Request
It gave an answer, I just don't know how it got there
[7]  2016/01/11 10:58   Female / Under 20 years old / Elementary school/ Junior high-school student / Useful /
Purpose of use
To find the answer for my EC Project because I couldn't find the formula online :(
Comment/Request
It was useful for the steps, but I would reccommend showing the steps to the answer, one by one, so students really get to understand it :)
[8]  2015/12/01 06:17   Male / 20 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
Digital design homework question about the number of combinations a rotary combination lock we made can have.
[9]  2015/06/14 13:34   Female / 20 years old level / High-school/ University/ Grad student / Useful /
Purpose of use
Calculating how many lottery tickets one would have to buy to ensure they would win, by purchasing as many tickets as there are combinations of numbers.
[10]  2015/06/01 10:09   Female / 30 years old level / Self-employed people / Useful /
Purpose of use
Helping 8th grader daughter with math

Sending completion

To improve this 'Combination with repetition Calculator', please fill in questionnaire.
Male or Female ?
Age

Occupation

Useful?

Purpose of use?