Problem
Use the spinner shown to answer the question. Assume that it is equally probable that the pointer will land on any one of the colored regions. If the pointer lands on a borderline, spin again. If the spinner is spun once, find the probability that the pointer lands in a red region. The probability that the pointer lands in a red region is (Type an integer or a simplified fraction.)
Solution
Step 1 ：Assume that the spinner has n equally sized regions and r of them are red.
Step 2 ：The probability that the pointer lands in a red region would be r/n.
Step 3 ：The final answer depends on the specific spinner used. The probability can be calculated using the function \(\frac{r}{n}\) where r is the number of red regions and n is the total number of regions.
Step 4 ：Final Answer: \(\boxed{\frac{r}{n}}\)
