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    Which of the following is a binary number?
    Question



    Which of the following is a binary number?

    A.

    201

    B.

    105

    C.

    101

    D.

    106

    E.

    130

    Correct option is C

    A binary number is a number that consists only of 0s and 1s. Among the given options, 101 is the only number that adheres to this rule.
    Important Key Points:
    1. Binary System: The binary number system uses only two digits: 0 and 1. It is the base-2 numeral system and is used in computer systems.
    2. Other Options: Numbers like 201, 105, 106, and 130 are decimal numbers because they include digits other than 0 and 1.
    Knowledge Booster:
    · Decimal Numbers: The standard numeral system (base-10) uses digits from 0 to 9.
    · Binary in Computing: Binary is fundamental in computing because it represents data and instructions in the form of electrical states (on/off).

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