Multiple choice

When the decimal number 9 is converted to the binary number, the number of binary digits it has is

  1. 3

  2. 4

  3. 5

  4. 7
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B Correct answer
Explanation

The decimal number 9 in binary is 1001, which has 4 binary digits. Converting: 9 = 4 remainder 1, 4 = 2 remainder 0, 2 = 1 remainder 0, 1 = 0 remainder 1, reading remainders backwards gives 1001.

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