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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