Sign up now
to enroll in courses, follow best educators, interact with the community and track your progress.
Principle of Inclusion and Exclusion
For those who are confused how in the second question A intersection B is 96... here's how... see make a block of Britishers and Americans .. treat them both as 1 and 1 .. now total number of people would be 5 including the 2 from the blocks ... now number of ways would be { cause it is a circular permutation (n-1)! } (5-1)! × 2! × 2! that turns out to be 96 .. :)
Rohit Yadav
10 months ago
for those who are still confused.. first two factorial is for Americans as a whole and British as sa whole arranging and the second one is for their interrnal arranggement