# Answer

A×b

2×1=2

2×5=10

# Steps

We have to multiply only :

- A=2, b=1,2 so we can do multiply two times
- A×b=2×1=2,2×5=10

#### Introduction to Higher Mathematics - Lecture 5: Set Theory

In this lecture we discuss the beginnings of set theory, a topic that runs throughout almost every area of mathematics. http://www.polymathlectures.org/