deirdremarshaloxl1fc deirdremarshaloxl1fc
  • 10-10-2017
  • Mathematics
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Using four of the letters of the​ alphabet, how many two​-letter codes can we form if we are allowed to use the same letter more than​ once?

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rbruce699 rbruce699
  • 10-10-2017
Aa,ab, ac, ad, ba, bb, bc, bd, ca, cb, cc, cd, da, db, dc, dd
16
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