幽靈的安息地
廢人廢語
點一下上面的發言可能有驚喜?
Showing posts with label
Maths
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Showing posts with label
Maths
.
Show all posts
Sunday, May 15, 2011
nCr, nPr, H
nCr 總是記不入腦
所以寫一寫
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