Question
Asked Oct 14, 2019
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How many 2 letter codes can be formed using A,B,C, and D if each letter can be used any numner of times in the code?

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Expert Answer

Step 1

Here we have two place and any letter can be at any place.

 

Now we have two place and in the first place we have 4 choices:  A, B, C and D.

 

Similarly, repe...

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