In addition to Steve's tips on expanding the right hand side of the equation, you can also make use of the first equation gives on the problem statement itself. Also, note this associative property of set notation: (A&B)&C = A&(B&C) where & = 'intersect'

Alumni Liaison

Ph.D. 2007, working on developing cool imaging technologies for digital cameras, camera phones, and video surveillance cameras.

Buyue Zhang