In computers we normally use** four** different **numbering systems - Decimal, Binary, Octal** and **Hexadecimal.**

**Decimal**is a number system which we humans normally use in our day-to-day transactions with currency, with counting etc. In this system we use the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 to denote various numbers.

In a **Binary** number system we use **0's** (*zeros*) and **1's** (*ones*) as the only symbols to represent numbers of all magnitudes (sizes). For example, a normal decimal number **3** (*three*), will be represented in a binary as **11**. We will learn more about it in the later sections.

Binary system is mostly using in computers and other computing devices.

**(Number)**base of number, for example

**(34)**10 is a decimal number (Thirty Four) and

**(11)**2 is a binary number

**11**(we will read it as One One and not Eleven) which actual represents a decimal number whose value is

**3**.

Since we normally use the decimal number system the decimal number **(124)**10 is simply written as **124**. However, if we want to represent a binary **One Zero One**, we will write it as 1012.

Similarly we have **octal **number system which uses** 8** as the base. It is usually used in digital displays and in representing file permissions under UNIX/Linux operating systems.

**Hexadecimal **or **Hex** is a number system that uses **16** as the base to represent numbers. We will learn more about octal and hexadecimal in the later sections.

**Select all the correct statements given below.**

**package q10852 :-**

A number system that uses only two digits, 0 and 1 is called the **Binary** number system.

The ten decimal digits are from **1** to **10**.

The two symbols **0** and **1** are known as bits in a** binary** system.

An **octal **system base is **8**.

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