To find out how many different ways Kaylee can select a group of 5 dolls from the 7 she has, we can use the combination formula. The combination formula is:
nCr = n! / [r! (n - r)!]
In this case:
n = total number of dolls = 7
r = number of dolls to be selected = 5
Plugging these values into the formula, we get:
7C5 = 7! / [5! (7 - 5)!]
7C5 = 7! / [5! 2!]
7C5 = (7 6 5!) / (5! 2)
7C5 = (7 * 6) / 2
7C5 = 21
Therefore, there are 21 different ways Kaylee can select a group of 5 dolls from the 7 she has to bring to her friend's house.
