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Quandaries & Queries
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 Topic: factorials
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15 items are filed under this topic.

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 An exercise with factorials 2016-02-07 From vidhi:find the value of n: (1-1/2) (2-2/3) (3-3/4)...(15-15/16) = n!/16Answered by Penny Nom. Factorials 2014-06-06 From penny:What is factorial? For eg. Like 2!, 3! 4! Etc.Answered by Penny Nom. (1-1/2)(2-2/3)(3-3/4)...(15-15/16)=n!/16 2011-02-15 From Fiona:Could you help me find the value of n: (1-1/2)(2-2/3)(3-3/4)...(15-15/16)=n!/16Answered by Penny Nom. Factorials 2010-03-23 From Leah:When should you use factorials?Answered by Robert Dawson. The tens digit of 0! + 1! + 2! + 3! + ... + 2000! 2009-12-21 From Alicia:What is the tens digit of 0! + 1! + 2! + 3! + ... + 2000!?Answered by Robert Dawson and Penny Nom. The tens digit of 0! + 1! + 2! + 3! + 4! .............+9999! + 10000! 2009-01-23 From Kaylyn:determine the tens digit for the expression: 0! + 1! + 2! + 3! + 4! .............+9999! + 10000!Answered by Robert Dawson and Penny Nom. n choose r equals n-1 choose r plus n-1 choose r - 1 2008-07-14 From fae:Prove that ( n ) = ( n – 1) + ( n - 1 ) ( r )         ( r )        (r-1) NOTE: the ( ) should be one for n taken r and so on. but there is no one big ( ) that will cater two linesAnswered by Janice Cotcher. Factorial fraction 2007-08-03 From Sekhoane:Expand completely: (N-2)!/N!(9N-1)!Answered by Stephen La Rocque. Probability of getting an A 2007-05-09 From Christine:In a class of 15 people, exactly 3 got an A. If 2 people are randomly chosen from this class, what is the probability that at least one of these 2 got an A?Answered by Paul Betts. n-1/(n+1)! + n+1/n! 2007-03-18 From Cody:How do you go about simplifying something like this; n-1/(n+1)! + n+1/n!?Answered by Steve La Rocque and Claude Tardif. Prove that p^n >= (p!)/(p-n)! 2006-02-02 From Rhydian:PROVE: pn >= (p!)/(p-n)! Answered by Penny Nom. n! > n^2 2004-03-30 From Jose:How can you prove by mathematical induction that: n! > n2.Answered by Penny Nom. When is 1! + 2! + 3! + ... + x! a square? 2002-08-19 From Sarathy:Solve : 1! + 2! + 3! + ... + x! = y 2 How do i find the solutions ? Answered by Claude tardif. 10,000! 2000-07-21 From Lauren:Hi I was just wondering if you could tell me how many zeros are in 100,000! (factorial.)Answered by Denis Hanson. 0! + 1! + 2! + 3! + ... + 2000! 1999-10-21 From Melissa:My name is melissa. I am a 9th grade student I am having trouble finding out how to do this: What is the tens digit of 0! + 1! + 2! + 3! + ... + 2000! I know how to find these, but my calculator cant go any higher than 69! Is there any way i can do this problem?Answered by Penny Nom.

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