Passing Derived class as a parameter to a method when the parameter type is base class

Question

I am a newbie and trying to understand concepts of inheritance and design patterns.

I came across this pattern http://en.wikipedia.org/wiki/Strategy_pattern when I w

Answer 1

The derived class is a base class. (That's the whole concept of inheritance: inheritance defines an 'is a' relationship).

Also, check out the Liskov substitution principle. :)