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#266096 - Thu May 05 2005 12:06 PM Mathematical Question
giantcomet4 Participant Registered: Sun Aug 08 2004 Posts: 13 Loc: London, England	How can you get the number 51 using mathematical operations and these numbers: 2,4,4,4,5? Note: Each number can only be used once and when squaring either use a four and two or two fours. Anyone who can help me out here?
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#266097 - Thu May 05 2005 01:29 PM Re: Mathematical Question
dg_dave Champion Poster Registered: Sun Oct 05 2003 Posts: 24575 Loc: near Stafford, Virginia USA	45 + 4 + 4 - 2 = 51 _________________________ The way to get things done is NOT to mind who gets the credit for doing them. --Benjamin Jowett No one can make you feel inferior without your consent. --Eleanor Roosevelt The day we lose our will to fight is the day we lose our freedom.
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#266098 - Thu May 05 2005 02:06 PM Re: Mathematical Question
sue943 Administrator Registered: Sun Dec 19 1999 Posts: 38005 Loc: Jersey Channel Islands	4x4=16-2=14x4=56-5=51 _________________________ Many a child has been spoiled because you can't spank a Grandma!
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#266099 - Mon Jul 04 2005 04:11 AM Re: Mathematical Question
someothername Participant Registered: Sat Jul 02 2005 Posts: 42	2+4!+4!-4+5, 2x4!+4+4-5, This reminds of the card game (using mathematical operators) involving being dealt 4 of the 40 cards up to ten in the deck and seeking to tally 24. _________________________ Let's coincide
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#266100 - Mon Jul 04 2005 06:25 AM Re: Mathematical Question
someothername Participant Registered: Sat Jul 02 2005 Posts: 42	4!+4!+5- the second root of 4 2!+4!+4!+(-4+5)! 4!+4!+ the second root of (4+5) 4!+4!+5-(4/2) 4!+4!-2+(5!/4!) but my favourite is (4+4)!/(4+2)!-5 and you could permit (4^4-52)/4 52-4^(4-4) et alia if you want to play forever. Edited by someothername (Sat Jul 09 2005 02:55 AM) _________________________ Let's coincide
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#266101 - Fri Jul 29 2005 01:44 AM Re: Mathematical Question
sue943 Administrator Registered: Sun Dec 19 1999 Posts: 38005 Loc: Jersey Channel Islands	You have me puzzled here, what is '!'? Does this follow the rules set down about squaring? _________________________ Many a child has been spoiled because you can't spank a Grandma!
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#266102 - Fri Jul 29 2005 01:49 AM Re: Mathematical Question
TabbyTom Moderator Registered: Wed Oct 17 2001 Posts: 8479 Loc: Hastings Sussex England UK	The exclamation mark indicates a factorial, i.e. the product of all the whole numbers from the number itself down to 1. So 4! = 4321 = 24. 5! = 5432*1 = 120, and so on. _________________________ Dilige et quod vis fac
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#266103 - Fri Jul 29 2005 01:53 AM Re: Mathematical Question
sue943 Administrator Registered: Sun Dec 19 1999 Posts: 38005 Loc: Jersey Channel Islands	Thanks TT, so those answers given by someothername don't follow the rules set down in the puzzle. The way I read it you would have to count the 4, 3, 2 and 1 each time and they do not exist. _________________________ Many a child has been spoiled because you can't spank a Grandma!
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#266104 - Fri Jul 29 2005 07:29 AM Re: Mathematical Question
ozzz2002 Moderator Registered: Mon Dec 03 2001 Posts: 20912 Loc: Sydney NSW Australia	Sorry, Sue, but 4! is a legitimate tactic in maths puzzles. The 'factorial' function is a common occurrence in probability equations- it can be scary at times, though.. the odds on winning some lotto games are really 'out there' _________________________ The key to everything is patience. You get the chicken by hatching the egg, not smashing it. Ex-Editor, Hobbies and Sports, and Forum Moderator
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#266105 - Fri Jul 29 2005 07:41 AM Re: Mathematical Question
sue943 Administrator Registered: Sun Dec 19 1999 Posts: 38005 Loc: Jersey Channel Islands	What I meant is according to the rule in the question asked, ie if squaring it must either be counted as two 4s or a 4 and a 2. By factoring you would then have to count each number and they simply do not appear in the sequence of numbers provided. _________________________ Many a child has been spoiled because you can't spank a Grandma!
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#266106 - Fri Jul 29 2005 09:23 AM Re: Mathematical Question
dg_dave Champion Poster Registered: Sun Oct 05 2003 Posts: 24575 Loc: near Stafford, Virginia USA	Quote: Sorry, Sue, but 4! is a legitimate tactic in maths puzzles. The 'factorial' function is a common occurrence in probability equations- it can be scary at times, though.. the odds on winning some lotto games are really 'out there' No kidding, especially if you figure some are 54! (545352...32*1). _________________________ The way to get things done is NOT to mind who gets the credit for doing them. --Benjamin Jowett No one can make you feel inferior without your consent. --Eleanor Roosevelt The day we lose our will to fight is the day we lose our freedom.
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#266107 - Fri Jul 29 2005 10:19 PM Re: Mathematical Question
peasypod Enthusiast Registered: Sun Oct 19 2003 Posts: 221 Loc: Tasmania Australia	The way I see the question, it says 'using mathematical operations and these numbers: 2,4,4,4,5'. ! (factorial) is a mathematical operation, not unsimilar to a + sign or - sign etc etc... _________________________ Do you ever get down on your knees and thank God you know me and have access to my dementia? -George Costanza
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#266108 - Sat Jul 30 2005 09:10 PM Re: Mathematical Question
someothername Participant Registered: Sat Jul 02 2005 Posts: 42	(4+2)!! +4 -5mod4 http://en.wikipedia.org/wiki/Factorial Edited by someothername (Sun Jul 31 2005 12:01 AM) _________________________ Let's coincide
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#266109 - Sun Jul 31 2005 12:02 AM Re: Mathematical Question
someothername Participant Registered: Sat Jul 02 2005 Posts: 42	Thanks everyone for taking an interest, does anyone know any other good questions? I should add this one: The integral of (t^4.e^-t.dt) + the integral of (t^4.e^-t.dt) + 4 - 5mod2 _________________________ Let's coincide
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#266110 - Wed Aug 03 2005 05:42 PM Re: Mathematical Question
satguru Forum Champion Registered: Thu Feb 17 2000 Posts: 8091 Loc: Kingsbury London UK	Just to say I had to give up at least three courses as I couldn't handle maths. I wish I could do complex equations for fun- I can't even do them to save my life! _________________________ Does the brain create or receive consciousness?
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