please answer this question
Answers
Answer:
head wait
Step-by-step explanation:
b is correct answer !!!!!
Step-by-step explanation:
a) considering B and D as one unit total number of people will be A,C,EandBD
that is 4 persons.therefore n in this case =4
arranging 4 persons sitting in circular pattern gives us formula (n-1)!
therefore (4-1)!
=3!
as B and D can exchange places it will be in 2!
=3!×2!
=6×2=12
if B and D sit next to each other total number of arrangements in circular order is 6×2=12
B)total number of permutations subtracted by permutations where A and D sit together = total no. of permutations where A and D won't sit together
total permutations around circle is (n-1)!
= (5-1)!
=4!
total no. of permutions where A and D sit together is as same as total no. of permutions where B and D sit together
=3!2!
therefore permutions where A and D do not sit next to eachother is 4!-3!2!
=24-12
=12
permutions where A and D don't sit next to eachother is 12