total number of ways = 5! = 120
2 siblings cannot sit together.So consider them as 1 unit.
total ways in which 4 people can sit = 4! = 24
the 2 siblings can sit among themselves in 2! ways.
5!-4!2! = 72
C
2 siblings cannot sit together.So consider them as 1 unit.
total ways in which 4 people can sit = 4! = 24
the 2 siblings can sit among themselves in 2! ways.
5!-4!2! = 72
C