Chris is studying the growth of a particular type of plant He is testing the effects of three growth factors lighting age and temperature Here are the levels he s testing for each Growth factor Levels Lighting Low Medium High Age 1 month 2 months 3 months 4 months 5 months Temperature 20 C 22 C 24 C 26 C He wants to find the number of ways of combining one level from each of the growth factors How many ways are there