A class photo is being taken of six students, sitting in a row. Jamie wants to sit next to Marshall. How many arrangements are possible?
Jamie and Marshall can sit 2 ways in any two seats and they can sit in seats 12, 23, 34, 45, 56 (5 ways)
The other student can be arranged in 4! ways for each of these
So.... the total possible arrangements are 2 * 5 * 4! = 10 * 24 = 240