Combination Calculator

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

Combination
number of things n
    1. n≧r≧0
number to be taken r

combinations nCr
    1.  
    Combination
    [1-10] /23Disp-Num
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    [1]  2021/01/18 22:35   Male / 30 years old level / An office worker / A public employee / Very /
    Purpose of use
    to compute possible combinations of optional filters in a database
    [2]  2020/09/02 04:02   Male / Under 20 years old / Elementary school/ Junior high-school student / Very /
    Purpose of use
    for the lolz
    [3]  2020/05/19 04:18   Female / Under 20 years old / Elementary school/ Junior high-school student / A little /
    Purpose of use
    homework
    Comment/Request
    would be nice if it showed exactly how it was calculated
    [4]  2020/03/18 03:35   Male / 50 years old level / An office worker / A public employee / Very /
    Purpose of use
    To calculate the customizable product options for an AI robot
    [5]  2020/01/30 21:52   Male / Under 20 years old / High-school/ University/ Grad student / Very /
    Purpose of use
    calculate scent combinations
    [6]  2019/09/24 01:06   Male / 20 years old level / High-school/ University/ Grad student / Very /
    Purpose of use
    Calculating the amount of combinations of 100-residue proteins using 20 amino acids
    [7]  2019/08/28 01:02   Male / 60 years old level or over / An office worker / A public employee / Very /
    Purpose of use
    Needed to calculate a very large probability based on the Combination of 10,000,000 chemicals taken 500,000 at a time. There are 862 thousand zeros on the end of that number. Bigger than a google (only 100 zeros), smaller than a google-plex (a google of zeros). Thanks you!
    [8]  2019/01/29 03:39   Male / 40 years old level / An office worker / A public employee / Very /
    Purpose of use
    Double checking. Had to try this as site was casio - brought back lots of treasured memories of how useful my scientific calculator was, thank you.
    [9]  2018/09/22 21:48   Female / 30 years old level / An office worker / A public employee / Very /
    Purpose of use
    I wanted to determine the feasibility of using top categories in my trivia league to make a fun personality type thing. With 18 categories, it is not feasible.
    [10]  2018/03/20 23:16   Female / Under 20 years old / High-school/ University/ Grad student / Useful /
    Purpose of use
    Homework

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