Question

How many gerbil groups are possible if choosing one out of a cage with 15 males and choosing another one out of a cage containing 21 females

Answer 1

There are 15 different ways to choose the first gerbil group (15 males) and 21 different ways to choose the second gerbil group (21 females). Therefore, the total number of possible gerbil groups is 15 x 21 = 315.