Pure Maths - inequality

Your question has some mistakes. n should be a positive integer, n > 1.

If n = 1, the equality holds and the inequality sign should be >= instead.

Method a:

http://i726.photobucket.com/albums/ww265/physicsworld2010/physicsworld01Feb261752.jpg

Method b:

http://i726.photobucket.com/albums/ww265/physicsworld2010/physicsworld02Feb261752.jpg

part (b) 用MI就行了。