Combinatorics Lesson 10 Principle of Mutual Exclusion and Inclusion
This video explains the principle of Mutual inclusion and exclusion along with the related problems.
Questions

0
What is floor and ceil value??

0
What is relatively prime number and Non relatively prime number??

1
Shouldn't 1 be also excluded?
1000 734 removes the common multiples of 2,3,5 but it doesn’t remove 1 which is also non relatively prime with 30.

1
on divisibility problem
so, In divisibility problem of principle of mutual of exclusion and inclusion,it is better to apply LCM of the factors.Am I correct?

3
the number between 11000 which are relatively prime to 80