Original subtitles

So welcome back and in this exercise, what we are going to do is once again to talk about arithmetic

sequence and basically it's going to be very singular exercise, but just we are going to calculate

something different.

So in this exercise, what you have to do is to write a program that calculates and Prince asks and

basically what is s.m?

It's the sum of a given sequence.

OK, so basically previously we had this sequence as an example and we said that the difference is two,

right?

That's the number, the difference between every two consecutive neighbors.

And also we have the initial theorem.

We had the number of elements in this sequence and we had a and which is the term of these given arithmetic

sequence.

So now what we have to do is previously we had one value, one terminology missing, and we had to use

some formula to find it out to find it through some calculations.

Now, what we will have to do is simply to use some other formula to find out what will be the sum of

all of these elements in a given sequence.

So basically, we could also summarize them just one after another.

So one plus three plus five plus seven plus nine and so on up until 17.

But this approach and this technique probably will won't be good enough if we are required to use it

with the eye to know, for example, the last element will be 999 will be pretty difficult to use it

in in using our calculator.

So for that, what we have to do is to use the following formula that specifies how you can count and

how you can calculate the sum of an arithmetic sequence.

So it goes like this.

The sum equals the sum of an elements equals two with the initial value plus the last value.

OK, the Ethereum multiplied by NP, which is the total number of elements in a given sequence divided

by two.

OK, so that's how you use it.

That's our formula.

That's the formula we are going to use for our calculations.

And of course, once again, we could have done it on a piece of paper.

But now what we have to do is to make it programmatically in our programming language.

So just to show you guys an example so we know SFM equals to this terminology of these formula.

So what will be the sum of these now of this sequence instead of calculating it one by one and adding

the result, it will be as of an equals to one, because that's the initial term.

Alphen, which is the anthem, which is 17 multiplied by an equals two nine nine elements divided by

two, which gives us a total of 18 multiplied by nine, divided by two, which is a total of nine,

multiplied by nine, which is a total of eighty one.

So that will be the sum of all the elements inside of this sequence with nine elements.

So I hope the task is clear to you guys.

Simply write a program that should read from the user and the element, which is an initial theorem,

a one in total terms, and the program should calculate the sum of these given arithmetic sequence.

So give it a try and I will see you in the Solutions video.