Thread: FREE/BARGAIN — Non-Fiction
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Old 02-24-2019, 05:30 AM   #1443
pdurrant
The Grand Mouse 高貴的老鼠
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Quote:
Originally Posted by GtrsRGr8 View Post
Would anyone be interested in knowing all of the possible (meaning chosen at random) combinations of the 13 presidents?
It's 13!/(4! x (13-4)!) = 715. (The number of combinations of 4 from 13. Also the number of combinations of 9 from 13, of course.)
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