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What is combination (3,1)

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What is combination (3,1)

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This means:  out of 3 letters (colors, etc), how many combinations are there of 1 letter each?

This is an odd question, since it asks for combinations of 1 letter each.

The answer would be 3.  With the letters in the word CAT, for example, the possibilities with 1 letter are C, A, and T.

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