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The first question you need to investigate: Is there ANYnumber that is a common factor of 21, 30, and 44 ?
If we can't find at least two of them, then we don't have to worry about "greatest".

The factors of 21 are: 1, 3, 7, and 21.
The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, and 30.
The factors of 44 are: 1, 2, 4, 11, 22, and 44.

The only factor common to 21, 30, and 44 is '1'.

Technically, I guess the answer to the question is 'Yes'. There is one common factor, so it's
also the greatest.

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15y ago

What else can I help you with?