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Maths question - what's the fomula

Henry Irving
Henry Irving Posts: 85,223
edited January 2007 in Other Football and Sports
for working out how many different numbers can be made from five single digit numbers?

So if I have 3, 5, 6, 8 and 2, how many different ways can you arrange these five numbers to make a five figure number such as 68,235.

This was actually part of my son's homework. He gave up after about two but I'm sure there is a formula to work it out.

C'mon all you IT geeks, you must know.

Comments

  • F-Blocker
    F-Blocker Posts: 3,409
    edited January 2007
    5x4x3x2(x1) = 120 possible scenarios

    Obviously if there were 7 numbers to start with it'd be 7x6x5x4x3x2(x1) etc.
  • AFKABartram
    AFKABartram Posts: 57,825
    this sounds like one for Ollie.....
  • Henry Irving
    Henry Irving Posts: 85,223
    [cite]Posted By: F-Blocker[/cite]5x4x3x2(x1) = 120 possible scenarios?

    Cheers F I knew it would be devilishly complicated like that!
  • kigelia
    kigelia Posts: 2,582
    I think the answer is 120 for a perm of 5 (assuming you are using whole numbers only if you are including the decimal point 35.682 then the number will increase quite a bit I think).
  • Charlton Dan
    Charlton Dan Posts: 4,937
    Matt Holland?
  • Solidgone
    Solidgone Posts: 10,208
    Thats a lottery!
  • Salad
    Salad Posts: 10,189
    [cite]Posted By: F-Blocker[/cite]5x4x3x2(x1) = 120 possible scenarios

    Obviously if there were 7 numbers to start with it'd be 7x6x5x4x3x2(x1) etc.
    F-Blocker is right (assuming each digit is unique).
  • 1905
    1905 Posts: 2,751
    edited January 2007
    That took us 4 minutes to answer. Are we clever of what :-) I wonder what would happen if we posted the question on the Millwall rivals site?
  • scruffle
    scruffle Posts: 2,282
    you just type in 5! in the calculator (thats what that ! sign does short hand of 5x4x3x2(x1))
  • MCS
    MCS Posts: 8,404
    [cite]Posted By: AFKA Bartram[/cite]this sounds like one for Ollie.....

    dood, how did you no that i cant add up for toffee! maths is the most hardest most difficultist thing to do ever in the world! My step dad used to help me with my mahs homework, he used to set me tests too, and i can tell ya however long i tried, and however much effort he put in, i was still a retard at maths.

    I am still a retard at maths.

    Well done bart
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  • son of selhurst
    son of selhurst Posts: 569
    [cite]Posted By: 1905[/cite]That took us 4 minutes to answer. Are we clever of what :-) I wonder what would happen if we posted the question on the Millwall rivals site?


    Someone would shout "house".

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