Hi,
Kindly anyone can help on below questions for PD:
Thanks in advance.

1. Create a visualforce page for opportunities that allows user to save or merge the current record. What approach -
A.  Custom Controller
B.  Custom Contoller extension
C.  Visualforce Java Script
D.  Standard Controller Methods.    

2. A developer must build an application that tracks which accounts have purchased specific pieces of equip Products. Each Account could purchase many pieces of equipment.
How should the developer track that an account has purchased a piece of equipment?
A.  Use the Asset object
B.  Use a custom object
C.  Use a Master-Detail on Product to Account
D.  Use a lookup on Account to Product    
 

I have performed a fast lookup and retrieved a list of objects. I need to make a decision based on the number of records returned - can I do this with a formula instead of having to use a loop to count the records?