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A letter lock consists of three rings each marked with six different letters. The number of distinct unsuccessful attempts to open the lock is at the most -

  • 216
  • 243
  • ✅ 215
  • 729
  • 728

Answer is "215"

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Andrea Andrea

I'm in exam, can any one give the solution for this question

Kimberly Kimberly

Thank you so much for the answer

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