jumbo67 jumbo67
  • 17-10-2019
  • Mathematics
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How many four-letter codes can be made if no letter can be used twice?

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futureschoalr1994
futureschoalr1994 futureschoalr1994
  • 17-10-2019

Answer:4 ways to make a code of 4 letters. 6C4=15, 4!=24, and 15×24=360

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