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13-06-2017
Mathematics

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Using all the letters in the alphabet how many two letter codes can we form if we are allowed to use the same letter twice?

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wizard123 wizard123

13-06-2017

There are 26 possible choices for the 1st letter in the code.
There are also 26 choices for the 2nd letter in the code.

---> 26*26 = 676 total possible two-letter codes

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