Relation between n! and n!! n!! = n!/(n-1)!! For example: 10!! = 10!/9!! = 3628800/945 = 3840 = 2·4·6·8·10 And according to the convention -1!! = 0!! = 0! = 1! = 1
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That's confusing. I thought 9!! was the same as (9!)! which is a number with almost two million digits.
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Notational confusion aside, n!! and (n!)! aren’t the same.
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If a double factorial halves the factors... Does a half factorial double them?
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and a factorialed factorial would ... um ... er ...
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Very interesting but worst notation ever ... one would assume (N!)!
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While 6! hours equals a month
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How many seconds are in 6 weeks? Exactly 10!
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The first part of the tweet merely defines what you mean by "double factorial", so why the "also" in the second part?
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Is that 9!! = 9! - 8! + 7! - 6! + 5! - 4! + 3! - 2! ?
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+1!, dammit...
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