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I'll assume that you mean " ... from the digits 0, 1, 2, 3, 4, 5, and 6 ?" .

-- If the same digit can appear more than once in the same combination,

then there are (7 x 7 x 7) = 343 possibilities.

-- If the three digits in one combination must all be different digits,

then there are (7 x 6 x 5) = 210 possibilities.

-- If the combinations are actual cou nting numbers, and so the first digit

can't be 'zero', then there are (6 x 6 x 5) = 180 possibilities.

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