What is NCR in Maths

Answer: NCR is a formula of combination and arrangement, where the object’s order does not matter so much. Basically, the NCR formula is used when the arrangement of a certain order has to be made without considering the order of things. 

The Formula of NCR is:  n_Cr=n! / r!n-r!

Here, 

• “n” stands for the total number of things and 
• “r” stands for the things chosen out of the “n” number of things. 

For example, if we need to select 3 books from 5 books, it can be selected in various ways. 

So, possible ways would be :  n_Cr= 5! / 3!5-3!

= 5x4x3x2x1 / 3x2x1x2

= 10 ways.