{"id":532,"date":"2017-10-28T00:53:34","date_gmt":"2017-10-27T19:23:34","guid":{"rendered":"http:\/\/ibelitetutor.com\/blog\/?p=532"},"modified":"2025-05-27T00:46:49","modified_gmt":"2025-05-26T19:16:49","slug":"permutations-and-combinations","status":"publish","type":"post","link":"http:\/\/ibelitetutor.com\/blog\/permutations-and-combinations\/","title":{"rendered":"Permutation and Combination"},"content":{"rendered":"

Permutations and Combinations<\/strong><\/span><\/h2>\n

‘Permutations and Combinations<\/strong>‘\u00a0is the next post of my series Online Maths Tutoring<\/strong>. It is very useful and interesting as a topic. It’s also very useful in solving problems of Probability. Our IB Maths Tutors<\/a><\/strong> say that to understand Permutations and Combinations, we first need to understand Factorial.<\/p>\n

Definition\u00a0of Factorial-<\/strong><\/span><\/p>\n

If we multiply n consecutive natural numbers together, then the product is called factorial of n. Its shown by n! or by<\/p>\n

for example : \u00a0 \u00a0 \u00a0\u00a0\"n!<\/p>\n

Some Properties of Factorials<\/strong><\/span><\/h4>\n

(i) Factorials can only be calculated for positive integers at this level. We use gamma functions to define non-integer factorial\u00a0that’s not required at this level<\/p>\n

(ii) Factorial of a number can be written as a product of that number with the factorial of its predecessor \u00a0 \u00a0\"n!<\/p>\n

\"<\/p>\n

(iii) \u00a0\"0!\u00a0 you can watch this video for the explanation.<\/p>\n