I don't know what Ord7 is, but in 52! there is floor(52/49)=1 multiple of 7^2=49, and floor(52/7)=7 multiples of 7 (including 49), so that makes 8 factors of 7.

Is that what you were looking for?

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- March 10th 2010, 10:19 PM #1

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- March 12th 2010, 11:56 PM #2

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