1. Since the bride and groom must be there in the picture, hence the photographer has to select 4 peoples out of 8 which can be done in 8C4 ways.
Now these 6 peoples can be arranged in 6! ways. Hence the total no. of arrangements
= 8C4 × 6!
= 8! ×6! / (8-4)! 4!
=(8×7×6×5×4!) (6×5×4!)/4! 4!
= 50400 ways
2. When bride and groom are together they can be considered as one
No. of ways = 8C4 × 5! × 2!
= 16800 ways
3. When bride is on the left of groom then the no. of ways are 8C4 ×5! = 8400 as now the bride and groom cannot swap.