2013 JJC P2 Q8

The layout of a minivan consisting of eight passenger seats is as shown below.

1. To make the ride more comfortable, each of the eight passenger seats is to be attached with either a red cushion or a blue cushion. Find the number of ways this can be done if both colours are used.[2]

Four boys and three girls board the minivan and occupy the passenger seats. Find the number of possible seating arrangements

2. if there are no restrictions,[1]
3. if no two boys sit next to each other when they are on the same side.[4]