Solve for the missing numbers
-

Question

Quizplus · Accepted Answer

The given string "11ebb7d6_6d7e_25ed_ad4c_9da31e7d0887_TB8285_11" is a hexadecimal representation of a UUID (Universally Unique Identifier).
In a UUID, certain bits represent certain information, and these bits have fixed values. 
The 13th bit (counting from the leftmost bit, starting with 0) represents the version of the UUID, which is always a 4 in randomly generated UUIDs (as in this case).
The 17th bit represents the variant or the layout of the UUID bit string, which is always 1, 2, or 3 in randomly generated UUIDs (as in this case). 
So, in the missing numbers, the 13th and 17th bits should be 4 and 1, respectively. 
Option D satisfies these conditions, as the 13th bit is 9B21 (which is hex of 1001101100100001 in binary, where the 13th bit is 1) and the 17th bit is 3 (as the first nibble of the 7th byte is D, which begins with 1101 in binary, indicating variant 3). 
Therefore, option D is the correct answer. The given string of characters is a UUID (Universally Unique Identifier), which is a 128-bit number. The first group of characters (11ebb7d6) represents the timestamp, the second group (6d7e) represents the version, the third group (25ed) represents the variant, and the last 12 characters represent a randomly generated sequence. 
In order to solve the missing number, we need to follow the rules of UUID generation. The third group (25ed) represents the variant, which is a fixed value. This means that the missing number must match the variant value of 25ed. 
Looking at the options, only option D has a third group of 9b21, which is the same as the given value 25ed when the bits are flipped. Therefore, D is the best choice.

Solve for the Missing Numbers