In a World Where Chastity is Reversed, I'm Someone Who's Easy to Get Laid With

"—So, this sigma is the sum of all the numbers in the number line."

"That's what it means !? That's so simple !"

Shaking off all sorts of temptations, we started studying maths.

Ayame san taught me the other day, so teaching Riria would also help me review the material. This might kill two birds with one stone.

"Oh, so that's what sigma means."

"You know...the teacher kept telling you that in math class...don't you remember?"

"Well.....I wasn't really listening...."

".....I was stupid to ask."

"But it's easier if you know what it means. The point is to add up all these numbers, right?"

"Well, that's it."

"But why do you use confusing letters for this? When I saw it, it looked like a bag of bread."

"Well, it does look like that."

"By the way, it's called a 'bread bag clip'."

"How do you know the name of the bread bag clip when you don't know what it means......"

"Well, it's just like the English word Bag Clip would be more fitting."

"I love how your English pronunciation is for nothing !"

While being tossed around by Riria's unexpected special skills, I proceeded with my learning.

It is a great progress to know the meaning of sigma in the problem of the number line. Knowing this makes a real difference.

"All right, let's see, add one, add two, add three......"

"Um, Sotogahama san?"

"What?"

"I mean, are you, by any chance, trying to add it all up?"

"Yeah, so......? Because that's what you do when you add up all the numbers in a sequence, isn't it?"

"Who would honestly add them all up !"

Why do we use the brainwave method of adding one by one when we are trying to find the sum in mathematics......

No, it's true that if you take the time to calculate without mistakes, you can definitely arrive at the correct answer.

Perhaps this woman is asking for probability calculations by writing out all the steps?

If she did that during the test, she would be overwhelmingly short on time. Even if there was a button for 100 million years, it would not be enough.

"You know, there is an efficient way to calculate this."

"You need to tell me that asap."

"Some of us notice this much, but..."

"I'm an idiot anyway !"

"Alright, alright, I'll explain it in a way that even a moron can understand, so please listen carefully."

This time, the sequence is very simple: the first term is 1, the common difference is also 1, and the number of terms is 99.

In short, it is a sequence of integers from 1 to 99.

The problem is to add all the integers from 1 to 99.

It is not wrong to add all of them as Riria did, but there is a smarter way to do it.

"Sotogahama san, what if you add one and ninety-nine?"