Urban roads tend to be wider. Sometimes they are more interesting, but that does not always have to be the case. D
They are usually paved, especially in Canada and the United States. I have not seen very many urban roads that are not paved, even those of the edge of the urban areas. Not C. Not B either.
Few are narrow although there are exceptions. White Avenue in Edmonton Alberta is 4 lanes but it still seems narrow to me. It is very interesting however. Not A
In urban areas, the roads themselves are generally narrower and more compact due to the inherent density of urban infrastructure and planning. This requires precision driving in dense traffic.
In recursion method, a method calls itself until a condition becomes true and returned back. In mystery(), at first time, first is 0 and last is 4. Condition is checked and 0!=4 so else part is executed in which again mystery is called with first as 1 and last 4. This will go again and again until first=4.
When first=4 it is also equal to last so if part is executed and alpha[4] is returned which is 9, now it comes alpha[3] +9 which is 8+9 =17 .
It is returning values to its previous calls that is why it will reduce to alpha[0]+alpha[1]+alpha[2]+17 which is nothing but sum of all elements of a alpha
