Permutations and Combinations-
‘Permutations and Combinations’ is the next post of my series Topics in IB Mathematics.It is very useful and interesting as a topic. It’s also very useful in solving problems of Probability. To understand Permutations and Combinations, we first need to understand Factorial.
Definition of Factorial- If we multiply n consecutive natural numbers together, then the product is called factorial of n. Its shown by n! or by
for example :
Some Properties of Factorials-
(i) Factorials can only be calculated for positive integers at this level. We use gamma functions to define non-integer factorial that’s not required at this level
(ii) Factorial of a number can be written as a product of that number with the factorial of its predecessor
(iii) you can watch this video for the explanation.