A jewelry store sells 14-karat gold rings, 18-karat gold rings, and platinum rings. Each ring is set with an emerald, ruby, sapphire, or diamond. Whole-number ring sizes are 5, 6, 7, and 8. determine the probability of finding a size 7 ring in 18-karat gold or platinum.

Question

A. 25%
B. 16.67%
C. 12.5%
D. 8.33%

Answer 1

C. 12.5%

Answer 2

Are you 100% sure?

Answer 3

I apologize for the error in my previous response. Let's calculate the probability correctly:

There are a total of 12 combinations:
- 3 choices for the type of metal (18k gold or platinum)
- 4 choices for the gemstone
- 4 choices for the ring size (5, 6, 7, or 8)

Out of these 12 combinations, there are 2 possibilities for a size 7 ring in 18-karat gold or platinum:
1. 18-karat gold ring, size 7
2. Platinum ring, size 7

Therefore, the probability of finding a size 7 ring in 18-karat gold or platinum is 2 out of 12, which simplifies to 1 out of 6 or approximately 16.67%.

So, the correct answer is:
B. 16.67%