Final answer:
The frequency set for combined wireless technologies b, g, and n is 2.4 GHz, which allows for interoperability and is less absorbed by common building materials.
Step-by-step explanation:
When combining wireless technologies such as b, g, and n, the frequency set for the combined technologies would be 2.4 GHz. These wireless standards are designed to operate over the 2.4 GHz band. Having a common frequency allows for better interoperability and compatibility among different devices and technologies within the same network. The 2.4 GHz frequency band is widely used in wireless networks because it is less susceptible to being absorbed by common building materials, making it an ideal choice for home and office Wi-Fi use.