Answer: There are 1,350 different ring selections.
Step-by-step explanation:
Given : The number of metals used for rings (gold, silver, or white gold ) =3
The number of stones they have = 15
The number of activity symbols = 30
By using the fundamental principal of counting , we have the total number of different ring selections as :-
![3\times15\times30=1,350](https://tex.z-dn.net/?f=3%5Ctimes15%5Ctimes30%3D1%2C350)
Therefore, there are 1,350 different ring selections.