7) I have a group of 10 people and I need to select 6 of them to pose for a photograph.Two of the 10 people are named Ken and Karen.

(a)How many ways can I arrange 6 people out of the group of 10 for the photograph if ken and karen must be in the photograph?

(b)How many ways can I arrange 6 people out of the group of 10 for the photograph if Ken and Karen must be in the photograph and they must appear next to each other in the photo?

I have no clue how to do this question,please help!