heavenholst7352 heavenholst7352
  • 04-08-2017
  • Mathematics
contestada

An identification code is to consist of 2 letters followed by 3 digits. how many different codes are possible if repetition is permitted question mark

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sergibcnusa sergibcnusa
  • 04-08-2017
I like the 'question mark' at the end:

26 letters (English), 10 digits (0,1,...9)

26*26*10*10*10 = 676000

Now, this was for LLDDD (Letter Letter Digit Digit Digit)

It seems this is the order they want. Other wise, one should multiply by all the combinations in the order: LDLDD, DLLDD, etc ... (10 combinations), but again it seems they want this LLDDD

So 676000



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