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Starting with three different letters, six two-letter combinations can be made, if the order of the two letters is important. Only three combinations can be made if the order of the two letters is not important.

Example: ABC

AB AC BA BC CA CB - six variations

But if (for your purposes) BA is the same as AB,

Then there are only three:

AB AC BC

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14y ago

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Q: How many combinations of two letters are possible from three letters?
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