Answer:
The real world AI application is Google Duplex. It is able to receive orders for making reservations. Then it calls the shop or the place and deals with the person and talks to him very fluently and informs you about the reservation. Some other general types of AI application are Google Assistant, Siri , Amazon Alexa and so on. But google Duplex is lot more advanced than them.
<span>If a user name can have seven letters (with no distinction between upper and lower case), and if a letter can be repeated, then the maximum number of names is 26x26x26x26x26x26x26, or 8,031,810,176. That is, slightly more than eight billion names are possible.</span>
You can just put “/“ to represent dividing