Principle of Inclusion and Exclusion

Naman Jolly

a year ago

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