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4096 Code combinations of four-digit tran­sponder code

An accepted definition of “digit” is the ten Arabic numerals 0 to 9. The “four-place” transponder code is octal containing only the Arabic numerals 0 to 7. Thus the total number of combinations is only 4096 (8 raised to the fourth power) vs. 10,000 (10 raised to the fourth power).

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