Answer:
Electronic mail is a method of exchanging messages between people using electronic devices. Email entered limited use in the 1960s, but users could only send to users of the same computer, and some early email systems required the author and the recipient to both be online simultaneously, similar to instant messaging.
Each of the 20 people has 19 other people to communicate to. If you add that all up you get 20*19 paths, but then each path is counted twice (back and forth), so we divide this by 2. 20*19/2 = 190.
The general forumula is n(n-1)/2
Answer: All of the above
Explanation:
200 OK, 301 permanently moved and 400 bad request all are the Hyper text transfer protocol (HTTP) response status type. The HTTP response status types basically indicated the complete request in the HTTP.
All these given types are the responses and request that are involved in the HTTP status type.
200 OK is one of the request which basically depends upon the HTTP status type success.
301 permanently moved is the response in the URL which are used for permanently change the resources of request.
And 400 bad request is not properly understand by server due to the invalid syntax in the HTTP.
A method is written with the header 'num' yourMethod(string name, num code). The method's type is <u>'num'.</u>
In the context of programming. a header refers to supplemental data placed at the beginning of a block of data being transmitted or stored. In the context of the Java method, the header is where you tell the Java program what value type if any, the method will return (a string value, an int value, a double value, etc). As well as the return type, you require a name for your method, which is also placed in the header. You can pass values over to your methods in between a pair of round brackets.
You can learn more about method in Java at
brainly.com/question/28489761
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