Question

Ewan makes chess boards from wood. Each board has three different kinds of wood. He has five kinds of wood it is workshop maple, cherry walnut, Poplar and birch how many different types of chess board can he make?

Answer 1

D.10

Explanation:

Answer 2

He can make 10 different types of boards.

This is a combination of 5 objects chosen 3 at a time:


`_nC_r=(n!)/(r!(n-r)!) \\ \\_5C_3=(5!)/(3!2!)=(120)/(12)=10`