If 2 are alike and the other 2 distinct
The number of ways in which any four letters can be selected from the word "EXAMINATION” if two letters are alike and other two are distinct.
The number of ways in which any four letters can be selected from the word "EXAMINATION” if two letters are alike and other two letters are also alike.
How are prisms and cylinders as well as pyramids and cones alike? [2 MARKS]